Chen, Song
Dong, Chuanming
Zhang, Jinyun
Tang, Baohua
Xi, Zhengrong
Cai, Fei
Gong, Yachi
Xu, Jianru
Qi, Longju
Wang, Qinghua
Chen, Jian http://orcid.org/0000-0003-0370-7979
Funding for this research was provided by:
Nantong Science and Technology Project (MS22016030)
National Natural Science Foundation of China (81501189)
Jiangsu Government Scholarship for Overseas Studies (JS-2016-061)
Article History
Received: 2 August 2018
Accepted: 9 November 2018
First Online: 7 January 2019
Compliance with ethical standards
: All procedures were performed after informed consent provision by the volunteers, with approval from the Ethics Committee of Nantong Maternal and Child Health Care Hospital, affiliated to Nantong University, China (license no. is 2016-023).