1. Department of Andrology; The Affiliated Hospital of Qingdao University; Qingdao China
2. Department of Reproduction; The Affiliated Hospital of Qingdao University; Qingdao China
3. Department of Pathology; The Affiliated Hospital of Qingdao University; Qingdao China
4. Department of Ultrasound; The Affiliated Hospital of Qingdao University; Qingdao China