1. Department of Reproductive Center the 940th Hospital of Joint Logistics Support Force of Chinese PLA Lanzhou 730050 P. R. China
2. Department of Health Service the 940th Hospital of Joint Logistics Support Force of Chinese PLA Lanzhou 730050 P. R. China
3. Department of Obstetrics and Gynecology The First Affiliated Hospital of Army Medical University Chongqing 400038 P. R. China
4. Ningxia Human Sperm Bank General Hospital of Ningxia Medical University Yinchuan 750004 P. R. China
5. Faculty of Thai Traditional Medicine Prince of Songkla University Songkla 90110 Thailand
6. School of Chinese Medicine Bozhou University Bozhou 236800 P. R. China
7. Department of Medical Biochemistry Faculty of Basic Medical Sciences College of Medicine Alex Ekwueme Federal University Ndufu-Alike, Ikwo 1010 Abakaliki, Ebonyi State Nigeria