Department of Endocrinology and Metabolism, West China Hospital, Sichuan University, Chengdu 610041, China. zhangqianying314@163.com. Department of Endocrinology and Metabolism, West China Hospital, Sichuan University, Chengdu 610041, China. lisheyu@gmail.com. Chinese Evidence-based Medicine Center, West China Hospital, Sichuan University, Chengdu 610041, China. ebmliling@hotmail.com. Department of Endocrinology and Metabolism, West China Hospital, Sichuan University, Chengdu 610041, China. qli.cherry@hotmail.com. Department of Endocrinology and Metabolism, West China Hospital, Sichuan University, Chengdu 610041, China. renky.sl@foxmail.com. Chinese Evidence-based Medicine Center, West China Hospital, Sichuan University, Chengdu 610041, China. sunx79@hotmail.com. Department of Endocrinology and Metabolism, West China Hospital, Sichuan University, Chengdu 610041, China. jerryli678@yahoo.com.