Key points are not available for this paper at this time.
University of California, San Francisco, Department of Psychiatry, 1001 Potrero Avenue, RM 7M-W21, San Francisco, CA 94110. Reprints: Tetine L. Sentell, University of California, San Francisco, Department of Psychiatry, 1001 Potrero Avenue, RM 7M-W21, San Francisco, CA 94110. E-mail: email protected
Sentell et al. (2003) studied this question.