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Sichuan Univ, West China Hosp, Chinese Evidence Based Med Ctr, Chengdu, Peoples R China
Sichuan Univ, West China Hosp, Clin Res & Evaluat Unit, Chengdu, Peoples R China
Hubei Univ Med, Taihe Hosp, Ctr Evidence Based Med & Clin Res, Shiyan 44200, Hubei, Peoples R China Sichuan Univ, West China Hosp, Chinese Evidence Based Med Ctr, Chengdu, Peoples R China