1. Department of Obstetrics and Gynecology; The Affiliated Hospital of Inner Mongolia Medical University; Hohhot China
2. Department of Geratology; The Affiliated Hospital of Inner Mongolia Medical University; Hohhot China
3. Department of Thoracic Surgery; The Affiliated Hospital of Inner Mongolia Medical University; Hohhot China
4. Department of Stomatology; The Affiliated Hospital of Inner Mongolia Medical University; Hohhot China