- Correspondence to Dr Jing Gao, Huai’an Maternity and Child Care Hospital, Huai’an, Jiangsu 223002, China; and Professor Xuefeng Yu, The Fourth Affiliated Hospital of Nanchang University, 133 Square South Road, Nanchang, Jiangxi 330003, China;
- Received 22 November 2016
- Revised 14 July 2017
- Accepted 13 August 2017
- Published online 4 November 2017.
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