1. Department of Obstetrics and Gynecology, Heping Hospital Affiliated to Changzhi Medical College, Changzhi, Shanxi, China.
2. Department of Reproductive Medicine, Heping Hospital Affiliated to Changzhi Medical College, Changzhi, Shanxi, China.
3. Department of Otorhinolaryngology, Heping Hospital Affiliated to Changzhi Medical College, Changzhi, Shanxi, China.