Institution: | 1. Office of Biostatistics, CDER, FDA, 10903 New Hampshire Ave, Silver Spring, , Marryland 20993, U.S.A.;2. Department of Psychology, University of California at Los Angeles, Los Angeles, , California 90095, U.S.A.;3. Department of Biostatistics, University of California at Los Angeles, , Los Angeles, California 90095, U.S.A. |