Correspondence
Qinrui Fu, Key Laboratory of Birth Regulation and Control Technology of
National Health Commission of China, Maternal and Child Health Care
Hospital of Shandong Province affiliated to Qingdao University, Qingdao
University, Jinan, 250014, China; Institute for Translational Medicine,
The Affiliated Hospital of Qingdao University, College of Medicine,
Qingdao University, Qingdao 266021, China.
Email: fuqinrui2018@163.com