Corresponding Author: Hongbo Qi, M.D, Ph.D., Xiaoqiu Xiao Ph.D. and Chao Tong Ph.D.

Department of Obstetrics and Gynecology, The First Affiliated Hospital of Chongqing Medical University, No. 1 Youyi Road, Yuzhong District, Chongqing 400016 (China)
Tel. +86 23 89011791; +86 23 89011102; +86 23 8901866, E-Mail qihongbo728@163.com; chaotongcqmu@163.com; bshaw2001@163.com ,