Affiliation: | 1.The 3rd Xiangya Hospital of Central South University, Changsha, Hunan, China;2.Key Laboratory of Medical Information Research (Central South University), College of Hunan Province, Changsha, Hunan, China;3.XiangYa School of Public Health (Central South University), Changsha, Hunan, China;4.XiDian University, Xi''an City, Shaanxi Province, China |