Gurland, Barry J. MB, MRCP, DPM.1; Ganz, Vivian Hoff M.A.1; Fleiss, Joseph L. Ph.D.1; Zubin, Joseph Ph.D.1
1Biometrics Research, New York State Department of Mental Hygiene and the Department of Psychiatry, Columbia University
Address for reprint requests: Dr. B. J. Gurland, Biometrics Research, 722 West 168 Street, New York, NY 10032.
Received for publication Mar 15, 1971; revision received Aug 27, 1971