1. Centre for Reproductive Medicine Women and Children's Hospital Qingdao University Qingdao 266011 China
2. Branch of Shandong Provincial Clinical Research Center for Reproductive Health Qingdao 266011 China
3. Medical Research Center The Affiliated Hospital of Qingdao University Qingdao University Qingdao 266000 China
4. Shandong Key Laboratory of Medical and Health Textile Materials College of Textile & Clothing Qingdao University Qingdao 266071 China
5. Qingdao Stomatological Hospital Affiliated to Qingdao University Qingdao 266001 China