1. Department of Pathology, Danzhou People’s Hospital , Nada Town , Danzhou, Hainan, 571799 , China
2. Department of Gynaecology and Obstetrics, Danzhou People’s Hospital , Nada Town , Danzhou, Hainan, 571799 , China
3. Occupational Physical Examination Outpatient, Haikou Center for Disease Control and Prevention , No. 56 Yehai Avenue, Qiongshan District , Haikou , Hainan, 570203 , China