1. Department of Urology, Jinan Central Hospital Affiliated to Shandong University, Jinan, People’s Republic of China
2. Department of Urology, The Affiliated Hospital of Qingdao University, Qingdao, People’s Republic of China
3. Department of Andrology, The Affiliated Hospital of Qingdao University, Qingdao, People’s Republic of China
4. Department of Obstetrics, The Affiliated Hospital of Qingdao University, Qingdao, People’s Republic of China