1. Department of Urology, Xinqiao Hospital, Amy Medical University, Chongqing, China
2. Reproductive Medicine Research Center, the Sixth Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China
3. Institute for Regenerative Medicine, Sechenov University, Moscow, Russia
4. Grain Science and Industry, Kansas State University, Manhattan, Kansas 66506, USA and Biological and Agricultural Engineering, Kansas State University, Manhattan, Kansas 66506, USA
5. Wake Forest Institute for Regenerative Medicine, Winston-Salem, North Carolina 27109, USA