Yang Yu-Qi, Wang Huai-Yan, Jiang Li-Hua, Zhang Yu-Ping, Yu Bing, Zhu Wei, Qin Zhi-Qiang
Changzhou Maternal and Child Health Care Hospital, Changzhou, Jiangsu 213003, China.
Zhongguo Dang Dai Er Ke Za Zhi. 2017 Sep;19(9):1020-1021. doi: 10.7499/j.issn.1008-8830.2017.09.017.