[1] Hainan Med Coll, Affiliated Hosp 1, 31 Longhua Rd, Haikou, Hainan, Peoples R China
[2] Hangzhou Xiaoshan Hosp Tradit Chinese Med, Hangzhou 311200, Zhejiang, Peoples R China
[3] Hangzhou Normal Univ, Sch Publ Hlth, Hangzhou 311121, Zhejiang, Peoples R China
[4] China Assoc Social Welf & Senior Serv, Beijing 100054, Peoples R China