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Guangdong Second Prov Gen Hosp, Ctr Clin Epidemiol & Methodol CCEM, 466 Newport Middle Rd, Guangzhou 510317, Guangdong, Peoples R China
McMaster Univ, Dept Hlth Res Methods Evidence & Impact HEI, 1280 Main St West, Hamilton, ON L8S 4L8, Canada Guangdong Second Prov Gen Hosp, Ctr Clin Epidemiol & Methodol CCEM, 466 Newport Middle Rd, Guangzhou 510317, Guangdong, Peoples R China