Corresponding Author

Department of Urology, Dokkyo Medical University Saitama Medical Center, Koshigaya, Japan

Correspondence

Hiroshi Okada, International Center for Reproductive Medicine, Dokkyo Medical University Saitama Medical Center, 2-1-50 Minamikoshigaya, Koshigaya, Saitama 343-8555, Japan.

Email: hirooka@dokkyomed.ac.jp