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*These authors contributed equally to this work.
Funded by National Natural Science Foundation of China (No:81471473); Chongqing Health Planning Commission project for training talented medical professionals (No. 2015XMSB0001298 and No. 2019ZDXM055).
Corresponding author, address and reprint requests to :
Yong Shao, PhD., M.D. The Department of Obstetrics and Gynecology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
E-mail:cqshaoyong@163.com
Tel:13101280793