Corresponding Author

Shan Bao

Department of Gynaecology and Obstetrics, Hainan General Hospital, Haikou, 570311 Hainan, China

Qingqing Lou and Shan Bao served as corresponding authors.

Correspondence

Qingqing Lou Postal address: Hainan General Hospital, No.19, Xiuhua Road, Xiuying District, Haikou 570311, Hainan, China. Phone: +8615312019129 Fax number: +089868642548

Email: 2444890144@qq.com

Shan Bao, Postal address: Hainan General Hospital, No.19, Xiuhua Road, Xiuying District, Haikou 570311, Hainan, China. Phone: +8613876393222 Fax number: +089868642507

Email: baoshan3@126.com