机构:Biometry and Mathematical Statistics Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, 20892., Maryland
机构:
Univ Calif San Francisco, Dept Epidemiol & Biostat, San Francisco, CA 94107 USAUniv Calif San Francisco, Dept Epidemiol & Biostat, San Francisco, CA 94107 USA
机构:
Harvard Univ, Sch Med, Beth Israel Deaconess Med Ctr, Boston, MA 02115 USAHarvard Univ, Sch Med, Beth Israel Deaconess Med Ctr, Boston, MA 02115 USA