[1] Sichuan Univ, West China Hosp, Thyroid & Parathyroid Surg Ctr, Chengdu, Sichuan, Peoples R China
[2] Sichuan Univ, West China Hosp, West China Sch Clin Med, Chengdu, Sichuan, Peoples R China
[3] Sichuan Univ, West China Hosp, Hlth & Management Ctr, 37 Guo Xue Xiang, Chengdu 610041, Sichuan, Peoples R China