Key points are not available for this paper at this time.
Department of Psychiatry, Washington University School of Medicine, St. Louis, Missouri. This investigation was supported in part by a U.S. Public Health Service Research Career Program Award (MH-18,292) from the National Institute of Mental Health, and also by the following U.S. Public Health Service Training Grants: Graduate Training Grant (MH-5804) in psychiatry and General Practitioner's Grant (MH-7698) in psychiatry.
Winokur et al. (Mon,) studied this question.