Zhang, Yun-Shu
Li, Ke-Qing
Sun, Jian-Hua
Li, Wei
Tong, Zhi-Hua
Yan, Bao-Ping
Ungvari, Gabor S.
Ng, Chee H.
Xiang, Yu-Tao http://orcid.org/0000-0002-2906-0029
Funding for this research was provided by:
Health and Family Planning Commission Hebei Province (NA)
Article History
First Online: 10 April 2018
Compliance with Ethical Standards
:
: All authors have no conflicts of interest to declare.
: All procedures performed in studies 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.
: Informed consent was obtained from all individual participants included in the study.