1. School of Nursing, Shandong University, Shandong, P.R. China
2. Department of Nursing, Reproductive Hospital Affiliated to Shandong University, Shandong, P.R. China
3. Center of Reproduction, Qilu Hospital of Shandong University, Shandong, P.R. China
4. Center of Reproduction, Hospital Affiliated to Shandong University of Traditional Chinese Medicine, Shandong, P.R. China
5. Department of Urinary Surgery, Linyi People’s Hospital, Shandong, P.R. China