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机构:
Sungkyunkwan Univ, Dept Clin Res Design & Evaluat, SAIHST, Seoul 06355, South Korea
Sungkyunkwan Univ, Ctr Clin Epidemiol, Samsung Med Ctr, Seoul 06351, South Korea
Johns Hopkins Med Inst, Dept Epidemiol & Med, Baltimore, MD 21287 USA
Johns Hopkins Med Inst, Welch Ctr Prevent Epidemiol & Clin Res, Baltimore, MD 21287 USA Kyung Hee Univ Hosp, Dept Internal Med, Seoul 02447, South Korea