Freesurfer

freesurfer@nmr.mgh.harvard.edu

17 participants
30086 discussions

kvlQuantify naming problem [possible fix]
by C.P. Frost 21 May '14

21 May '14

Hello all, My site has recently upgraded to the newest version of Freesurfer, and I've run a set of subjects on recon-all using the hippocampal subfield segmentation flag. Everything went well. Then in running kvlQuantifyHippocampalSubfieldSegmentations.sh, I received error messages indicating that certain expected files didn't exist. In particular, among output files labeled with the scheme $subj/mri/posterior_$side_$struct.mgz, the script expected ...CA2-3.mgz and ...CA4-DG.mgz, and existing files were named ...CA2_3.mgz and ...CA4_DG.mgz -- in other words, the script expected a hyphen but instead the filenames contained an underscroe. After renaming the files appropriately, kvlQuantify... successfully generated the nonPartialVolumeStats files and everything worked fine. I didn't see any threads with this solution, and only one or two that mentioned the problem (http://bit.ly/1vHbV5K) so I thought I'd offer it up in case it could be addressed in a future release. Cheers, C.P. Frost

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Desikan Killiany Atlas measurements
by Buse Merve Ürgen 21 May '14

21 May '14

Dear all, I want to get the measurements of meancurvature, thickness, white matter volume and gray matter volume based on Desikan-Killiay Atlas. I would like to learn whether the commands I used to get them are the correct ones (in terms of content) & for Desikan Killiany atlas? *For meancurv: * aparcstats2table --hemi lh --subjects S1 S2 S3 --parc aparc --meas meancurv -t lh.parc.meancurv.txt *For thickness:* aparcstats2table --hemi rh --subjects S1 S2 S3 --parc aparc --meas meancurv -t rh.parc.meancurv.txt *For WM volume:* asegstats2table --all-segs --subjects S1 S2 S3 \-t table.wmparc.txt -d space --stats wmparc.stats *For GM volume:* aparcstats2table --subjects S1 S2 S3 --hemi lh --meas volume --parc=aparc --tablefile aparc_lh_volume_table.txt Thanks in advance,

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CTABreadASCII error with mris_label2annot
by Paul Beach 21 May '14

21 May '14

Freesurfer folks, I'm trying to compile an annotation using mris_label2annot after transferring fsaverage5 labels to a single subject. I'm getting a strange error. Essentially it looks like it can't find most of my transferred labels, which doesn't make sense as they are definitely in the directory in which I'm executing the command. The same error happens with both hemispheres. I am including an 'unknown' entry in the ctab files. I've tried changing things around with my ctab files and it looks like it just won't take in anything past the first '-l' flag in the mris_label2annot command. *Reading ctab rh.Yeo_7Net_split.ctab* *Number of ctab entries 2* *$Id: mris_label2annot.c,v 1.17 2011/03/02 00:04:32 nicks Exp $* *cwd /extern/research/PI/training/beachpau/Beach_FreeSurfer_data/HS_001/label* *cmdline mris_label2annot --s HS_001 --h rh --ctab rh.Yeo_7Net_split.ctab --annot Yeo_7Net_split_aparc --l rh.Background+FreeSurfer_Defined_Medial_Wall.label --l rh.7Networks_RH_Vis.label --l rh.7Networks_RH_SomMot.label --l rh.7Networks_RH_DorsAttn_Post.label --l rh.7Networks_RH_DorsAttn_FEF.label --l rh.7Networks_RH_DorsAttn_PrCv.label --l rh.7Networks_RH_SalVentAttn_TempOccPar.label --l rh.7Networks_RH_SalVentAttn_PrC.label --l rh.7Networks_RH_SalVentAttn_FrOper.label --l rh.7Networks_RH_SalVentAttn_PFCv.label --l rh.7Networks_RH_SalVentAttn_PFCl.label --l rh.7Networks_RH_SalVentAttn_Med.label --l rh.7Networks_RH_Limbic_OFC.label --l rh.7Networks_RH_Limbic_TempPole.label --l rh.7Networks_RH_Cont_Par.label --l rh.7Networks_RH_Cont_Temp.label --l rh.7Networks_RH_Cont_PFCv.label --l rh.7Networks_RH_Cont_PFCl.label --l rh.7Networks_RH_Cont_pCun.label --l rh.7Networks_RH_Cont_Cing.label --l rh.7Networks_RH_Cont_PFCmp.label --l rh.7Networks_RH_Default_Par.label --l rh.7Networks_RH_Default_Temp.label --l rh.7Networks_RH_Default_PFCv.label --l rh.7Networks_RH_Default_PFCm.label --l rh.7Networks_RH_Default_PCC.label * *sysname Linux* *hostname gauss.rad.msu.edu <http://gauss.rad.msu.edu>* *machine x86_64* *user beachpau* *subject HS_001* *hemi rh* *SUBJECTS_DIR /extern/research/PI/training/beachpau/Beach_FreeSurfer_data* *ColorTable rh.Yeo_7Net_split.ctab* *AnnotName Yeo_7Net_split_aparc* *nlables 26* *LabelThresh 0 0.000000* *Loading /extern/research/PI/training/beachpau/Beach_FreeSurfer_data/HS_001/surf/rh.orig* * 1 65793 rh.Background+FreeSurfer_Defined_Medial_Wall* * 2 -1 NOT_FOUND* * 3 -1 NOT_FOUND* * 4 -1 NOT_FOUND* * 5 -1 NOT_FOUND* * 6 -1 NOT_FOUND* * 7 -1 NOT_FOUND* * 8 -1 NOT_FOUND* * 9 -1 NOT_FOUND* *10 -1 NOT_FOUND* *11 -1 NOT_FOUND* *12 -1 NOT_FOUND* *13 -1 NOT_FOUND* *14 -1 NOT_FOUND* *15 -1 NOT_FOUND* *16 -1 NOT_FOUND* *17 -1 NOT_FOUND* *18 -1 NOT_FOUND* *19 -1 NOT_FOUND* *20 -1 NOT_FOUND* *21 -1 NOT_FOUND* *22 -1 NOT_FOUND* *23 -1 NOT_FOUND* *24 -1 NOT_FOUND* *25 -1 NOT_FOUND* *26 -1 NOT_FOUND* *Mapping unhit to unknown* *Found 5 unhit vertices* *Writing annot to /extern/research/PI/training/beachpau/Beach_FreeSurfer_data/HS_001/label/rh.Yeo_7Net_split_aparc.annot* I have attached my .ctab files in case they would help. -- Paul Beach DO/PhD candidate - Year VI Michigan State University - College of Osteopathic Medicine - Neuroscience Program - MSU *Co*gnitive and *Ge*riatric *N*eurology *T*eam (*CoGeNT*)

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Re: [Freesurfer] R: Filipping issue
by Douglas N Greve 21 May '14

21 May '14

Hi Paola, please remember to post to the list and not to us personally. thanks! I would still use the xhemi tools for this. If you have N subjects, you will get 2*N surfaces aligned to the fsaverage_sym atlas. You can then just pick the ones you want to analyze further doug On 04/22/2014 08:34 AM, Paola Valsasina wrote: > Dear Doug, > > We have followed your suggestion and we performed the recon-all analysis for > all study subjects (till autorecon3) on non-flipped images. > > I am now reading the instructions on the wiki about the xhemi tool, but I am > not 100% sure they apply to our case. > > The wiki instructions describe a comparison between LH and RH within > subjects (i.e., an analysis of cortical asymmetry), whereas we would like > simply to L-R flip the final surfaces of patients having a RH damage, so > that all patients have the damage in the LH. > Then, we would like to compare them with control subjects. > > For this purpose, is it sufficient to register the patients lesioned in the > RH to the symmetric template with the --xhemi option? > > (i.e. surfreg --s subject_name --t fsaverage_sym --xhemi --rh --lh) > > Then, how do we perform final statistical analysis? > > Thank you in advance for any suggestion! > Kind regards > Paola > > > > Paola Valsasina, MSc > Research Fellow > Neuroimaging Research Unit (Director Prof. M. Filippi) > Institute of Experimental Neurology, Division of Neuroscience, > Scientific Institute and University "Vita-Salute" San Raffaele > Via Olgettina 60, 20132 Milan, Italy > > -------------------------------------------------------------------------- > IL MIO 5XMILLE VA AL SAN RAFFAELE DI MILANO > PERCHE' QUI LA RICERCA DIVENTA CURA. > CF 07636600962 > SE NON QUI, DOVE? > Info: 5xmille(a)hsr.it - http://www.5xmille.org/ > > > Disclaimer added by CodeTwo Exchange Rules 2007 > http://www.codetwo.com > > -----Messaggio originale----- > Da: freesurfer-bounces(a)nmr.mgh.harvard.edu > [mailto:freesurfer-bounces@nmr.mgh.harvard.edu] Per conto di Douglas N Greve > Inviato: giovedì 13 febbraio 2014 21.50 > A: freesurfer(a)nmr.mgh.harvard.edu > Oggetto: Re: [Freesurfer] Filipping issue > > > Definitely #2. You should use the xhemi tools > http://surfer.nmr.mgh.harvard.edu/fswiki/Xhemi > First run them through recon-all as normal, then follow the steps on the > wiki. Contact the list again to get instructions for the final analysis. > > doug > > > On 02/13/2014 08:23 AM, Paola Valsasina wrote: >> Dear List, >> >> we are starting the analysis of cortical thickness for a group of >> patients who have only one side affected. The majority of patients >> have the left hemisphere affected, but some patients have the right >> hemisphere affected. In order to do a group analysis, we would like to >> flip the images of some patients, so that the affected side is left >> for all subjects. >> >> Which is the best way to do this: >> >> 1)flip the 001.mgz volume and perform the entire recon-all pipeline >> with flipped images; >> >> or >> >> 2)perform the recon-all pipeline with the non-flipped volumes and flip >> only the final surfaces for statistical purposes? >> >> Thank you for any suggestion >> >> Kind regards >> >> Paola >> >> >> >> _______________________________________________ >> Freesurfer mailing list >> Freesurfer(a)nmr.mgh.harvard.edu >> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer -- Douglas N. Greve, Ph.D. MGH-NMR Center greve(a)nmr.mgh.harvard.edu Phone Number: 617-724-2358 Fax: 617-726-7422 Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2 www.nmr.mgh.harvard.edu/facility/filedrop/index.html Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/

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change background color in tksurfer
by charujing123 21 May '14

21 May '14

Hi FS experts and users I want to change the background color of tksurfer from black to white. However I cannot find the drop-down list. Is there anyone who can tell me to desolve this? Thanks. All the best. Rujing Zha 2014-05-14 charujing123

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Fwd: Welcome to the "Freesurfer" mailing list
by bara bere 21 May '14

21 May '14

im get it ---------- Forwarded message ---------- From: freesurfer-request(a)nmr.mgh.harvard.edu Date: Wed, 21 May 2014 09:51:02 -0400 Subject: Welcome to the "Freesurfer" mailing list To: bara9114(a)gmail.com Welcome to the Freesurfer(a)nmr.mgh.harvard.edu mailing list! To post to this list, send your email to: freesurfer(a)nmr.mgh.harvard.edu General information about the mailing list is at: https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer If you ever want to unsubscribe or change your options (eg, switch to or from digest mode, change your password, etc.), visit your subscription page at: https://mail.nmr.mgh.harvard.edu/mailman/options/freesurfer/bara9114%40gmai… You can also make such adjustments via email by sending a message to: Freesurfer-request(a)nmr.mgh.harvard.edu with the word `help' in the subject or body (don't include the quotes), and you will get back a message with instructions. You must know your password to change your options (including changing the password, itself) or to unsubscribe. It is: BaRa9114 Normally, Mailman will remind you of your nmr.mgh.harvard.edu mailing list passwords once every month, although you can disable this if you prefer. This reminder will also include instructions on how to unsubscribe or change your account options. There is also a button on your options page that will email your current password to you. The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.

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Re: [Freesurfer] Mean Thickness for each hemisphere from ?.aparc.stats
by amirhossein manzouri 21 May '14

21 May '14

Thanks Doug, I used the first link and works perfectly now! Best regards, Amirhossein Manzouri On Tue, May 20, 2014 at 5:03 PM, Douglas N Greve <greve(a)nmr.mgh.harvard.edu>wrote: > > I just ran it, and it works fine. It may be that I need to give you more > libraries. > > Start with this one > ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/fsutils.py > > Copy it into $FREESURFER_HOME/bin (after making a backup of the original > one) > > If that still does not work, then copy this one > > ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/fsutils.pyc > > doug > > > > On 05/20/2014 04:36 AM, amirhossein manzouri wrote: > >> Dear Doug, >> Kindly find attached a sample of my lh.aparc.stats file! >> >> Best regards, >> Amirhossein Manzouri >> >> >> >> >> On Mon, May 19, 2014 at 7:59 PM, Douglas N Greve < >> greve(a)nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu>> wrote: >> >> Can you send me your lh.aparc.stats file? >> doug >> >> >> On 05/14/2014 01:41 PM, amirhossein manzouri wrote: >> >> >> Yes! >> >> >> On May 14, 2014 7:16 PM, "Douglas N Greve" >> <greve(a)nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu> >> <mailto:greve@nmr.mgh.harvard.edu >> <mailto:greve@nmr.mgh.harvard.edu>>> wrote: >> >> >> Is the mean thickness in the ?h.aparc.stats file? >> Something like >> >> # Measure Cortex, MeanThickness, Mean Thickness, 2.27227, mm >> >> >> On 05/13/2014 05:18 PM, amirhossein manzouri wrote: >> >> Hi, >> The same result! the last is insula ! >> >> >> Best regards, >> Amirhossein Manzouri >> >> >> >> >> On Mon, May 12, 2014 at 5:05 PM, Douglas N Greve >> <greve(a)nmr.mgh.harvard.edu >> <mailto:greve@nmr.mgh.harvard.edu> >> <mailto:greve@nmr.mgh.harvard.edu >> <mailto:greve@nmr.mgh.harvard.edu>> >> <mailto:greve@nmr.mgh.harvard.edu >> <mailto:greve@nmr.mgh.harvard.edu> >> >> <mailto:greve@nmr.mgh.harvard.edu >> <mailto:greve@nmr.mgh.harvard.edu>>>> wrote: >> >> Try this version >> ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/ >> greve/aparcstats2table >> >> >> >> On 05/12/2014 03:41 AM, amirhossein manzouri wrote: >> >> Hi again, >> I think I missed my question, How can I get >> the Mean >> Thickness >> of each hemisphere for several subjects using the >> aparcstats2table command? >> >> On Fri, May 9, 2014 at 4:28 PM, amirhossein >> manzouri >> <a.h.manzouri(a)gmail.com >> <mailto:a.h.manzouri@gmail.com> >> <mailto:a.h.manzouri@gmail.com >> <mailto:a.h.manzouri@gmail.com>> >> <mailto:a.h.manzouri@gmail.com <mailto:a.h.manzouri@gmail.com> >> <mailto:a.h.manzouri@gmail.com >> <mailto:a.h.manzouri@gmail.com>>> >> <mailto:a.h.manzouri@gmail.com >> <mailto:a.h.manzouri@gmail.com> >> <mailto:a.h.manzouri@gmail.com >> <mailto:a.h.manzouri@gmail.com>> >> <mailto:a.h.manzouri@gmail.com >> <mailto:a.h.manzouri@gmail.com> >> <mailto:a.h.manzouri@gmail.com >> <mailto:a.h.manzouri@gmail.com>>>>> wrote: >> >> Dear Doug, >> I have read this >> post( >> https://www.mail-archive.com/freesurfer@nmr.mgh.harvard.edu/msg25218.html >> ) >> regarding >> extracting Mean Cth of each hemisphere and >> I just get >> insula as >> the last and totally 34 numbers, I use >> aparcstats2table --hemi lh --subjects bert -m >> thickness >> --tablefile lh.Cth.bert.txt >> >> >> >> Best regards, >> Amirhossein Manzouri >> >> >> >> >> -- Douglas N. Greve, Ph.D. >> MGH-NMR Center >> greve(a)nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu> >> <mailto:greve@nmr.mgh.harvard.edu >> <mailto:greve@nmr.mgh.harvard.edu>> >> <mailto:greve@nmr.mgh.harvard.edu >> <mailto:greve@nmr.mgh.harvard.edu> >> >> <mailto:greve@nmr.mgh.harvard.edu >> <mailto:greve@nmr.mgh.harvard.edu>>> >> Phone Number: 617-724-2358 <tel:617-724-2358> >> <tel:617-724-2358 <tel:617-724-2358>> >> <tel:617-724-2358 <tel:617-724-2358> <tel:617-724-2358 >> <tel:617-724-2358>>> >> Fax: 617-726-7422 <tel:617-726-7422> >> <tel:617-726-7422 <tel:617-726-7422>> <tel:617-726-7422 >> <tel:617-726-7422> >> >> <tel:617-726-7422 <tel:617-726-7422>>> >> >> >> Bugs: >> surfer.nmr.mgh.harvard.edu/fswiki/BugReporting >> <http://surfer.nmr.mgh.harvard.edu/fswiki/BugReporting> >> <http://surfer.nmr.mgh.harvard.edu/fswiki/BugReporting> >> <http://surfer.nmr.mgh.harvard.edu/fswiki/ >> BugReporting> >> FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2 >> www.nmr.mgh.harvard.edu/facility/filedrop/index.html >> <http://www.nmr.mgh.harvard.edu/facility/filedrop/index.html> >> <http://www.nmr.mgh.harvard. >> edu/facility/filedrop/index.html> >> <http://www.nmr.mgh.harvard. >> edu/facility/filedrop/index.html> >> Outgoing: >> ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/ >> >> >> >> The information in this e-mail is intended only >> for the >> person to >> whom it is >> addressed. If you believe this e-mail was sent to >> you in >> error and >> the e-mail >> contains patient information, please contact the >> Partners >> Compliance HelpLine at >> http://www.partners.org/complianceline . If the e-mail was sent >> to >> you in error >> but does not contain patient information, please >> contact the >> sender and properly >> dispose of the e-mail. >> >> >> >> -- Douglas N. Greve, Ph.D. >> MGH-NMR Center >> greve(a)nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu> >> <mailto:greve@nmr.mgh.harvard.edu >> <mailto:greve@nmr.mgh.harvard.edu>> >> Phone Number: 617-724-2358 <tel:617-724-2358> >> <tel:617-724-2358 <tel:617-724-2358>> >> Fax: 617-726-7422 <tel:617-726-7422> <tel:617-726-7422 >> <tel:617-726-7422>> >> >> Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting >> <http://surfer.nmr.mgh.harvard.edu/fswiki/BugReporting> >> <http://surfer.nmr.mgh.harvard.edu/fswiki/BugReporting> >> FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2 >> www.nmr.mgh.harvard.edu/facility/filedrop/index.html >> <http://www.nmr.mgh.harvard.edu/facility/filedrop/index.html> >> <http://www.nmr.mgh.harvard.edu/facility/filedrop/index.html> >> Outgoing: >> ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/ >> >> >> -- Douglas N. Greve, Ph.D. >> MGH-NMR Center >> greve(a)nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu> >> Phone Number: 617-724-2358 <tel:617-724-2358> >> Fax: 617-726-7422 <tel:617-726-7422> >> >> Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting >> <http://surfer.nmr.mgh.harvard.edu/fswiki/BugReporting> >> FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2 >> www.nmr.mgh.harvard.edu/facility/filedrop/index.html >> <http://www.nmr.mgh.harvard.edu/facility/filedrop/index.html> >> Outgoing: >> ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/ >> >> >> > -- > Douglas N. Greve, Ph.D. > MGH-NMR Center > greve(a)nmr.mgh.harvard.edu > Phone Number: 617-724-2358 > Fax: 617-726-7422 > > Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting > FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2 > www.nmr.mgh.harvard.edu/facility/filedrop/index.html > Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/ > >

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how to get scalp-cortex diff instead of white-pial diff?
by Christopher Chatham 20 May '14

20 May '14

Dear Freesurfer experts, I would like to get a map of scalp-cortex distance for every vertex on the pial surface (for use in predicting the effects of TMS). I believe there is no existing automated method for doing this. Are there any suggestions for how to calculate a scalp-cortex distance map? My current plan is simply rename my files so that the outer_skin takes the place of the pial surface, and the pial surface takes the place of the white matter boundary. Would this allow me to run mri_thickness as normal and get a scalp-cortex distance map? Alternatively, I might create a new version of mris_thickness.c in which all references to the "white" surface are replaced with references to the outer_skin surface constructed by mri_watershed, though I am new to c and thus hesitant to take this approach. (Also, I have only a MEMPRAGE and no FLASH 5/30 sequences, so I cannot use mri_make_bem_surfaces; is the latter is still considered preferable?) Any suggestions or thoughts would be highly appreciated.

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Monte Carlo Cluster Size Threshold
by Wegman, Clem J. 20 May '14

20 May '14

Hello Freesurfer Experts, I am looking for the threshold cluster size used in a Monte Carlo Simulation (ran in qdec) at p=0.05. I believe the attached pdf (used to be mc-z.abs.th13.pdf) contains this information but I am not sure about how it is annotated. Does "MaxClustBin" correspond to a cluster size (in mm^2) and "MaxClustPDF" correspond to the p-value? From this file p=0.05 would correspond to a cluster size of 375.6 mm^2. I am basing these assumptions off of a previous message from the archives (https://mail.nmr.mgh.harvard.edu/pipermail/freesurfer/2013-August/032738.ht…) although I am looking at a different file because the one suggested (cache.th13.abs.pdf.dat) did not seem to contain the correct information. Thanks a bunch for your help! -John

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freeview vs tksurfer
by S.V.Shepherd [work] 20 May '14

20 May '14

Hi all, Two questions: First, does Freeview currently support flatmaps, or -patch support still in development? Second, I notice some different behavior between tksurfer and freeview *vis-a-vis *surface overlays. In tksurfer, we were able to plot volume overlays to surfaces by specifying a registration file, e.g. * tksurfer <subjID> <hemi> inflated -overlay <funcdir>bold/<analysis>/<contrast>/<result>.nii -overlay-reg <funcdir>/bold/register.dat* though care must be taken to specify the registration, since * tksurfer <subjID> <hemi> inflated -overlay <funcdir>bold/<analysis>/<contrast>/<result>.nii* alone shows the intersection of the volume with the surface, rather than mapping the volume to the surface as desired. When I try to replicate this in freeview, by calling * freeview -f <subjdir>/surf/<hemi>.inflated:overlay=<funcdir>/bold/<analysis>/<contrast>/<result>.nii:overlay_reg=<funcdir>/bold/register.dat* I continue to get something that looks like an intersection, rather than a mapping. I can get around this by separately painting the volumes to surfaces, but if there's a way to view the data in one step, this is more desirable. Thanks! stephen *stephen v. shepherd phd* The Rockefeller University / 1230 York Avenue / New York NY 10065-6307 USA // 212.327.7620

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