Zhu, Lei
Yin, Hong
Sun, Haomiao
Qian, Tong
Zhu, Junling
Qi, Gongjian
Wang, Yin
Qi, Boxiang
Funding for this research was provided by:
Jiangsu Provincial Commission of Health and Family Planning (Q201617)
Xuzhou Science and Technology Planning (KC16SL140)
Article History
Received: 16 January 2019
Accepted: 4 April 2019
First Online: 26 April 2019
Compliance with ethical standards
: The study was conducted in accordance with the ethical principles stated in the Declaration of Helsinki and Chinese regulatory requirements, and the study was approved by the Hospital Medical Ethics Committee with the informed consent of the parents of the children.
: The authors declare that they have no competing interests.
: All procedures performed in the study involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.