机构:
Columbia Univ, Sch Publ Hlth, Dept Biostat, New York, NY 10027 USAJohns Hopkins Univ, Div Gastroenterol & Hepatol, Sch Med, Baltimore, MD 21218 USA
机构:
Yale Univ, Sch Med, Dept Internal Med, Gen Internal Med Sect, New Haven, CT 06510 USAYale Univ, Sch Med, Dept Internal Med, Gen Internal Med Sect, New Haven, CT 06510 USA