Zhou, Chunyao
Wang, Yongheng
Liu, Xing
Liang, Yuchao
Fan, Ziwen
Jiang, Tao
Wang, Yinyan
Wang, Lei http://orcid.org/0000-0002-6916-704X
Funding for this research was provided by:
National Basic Research Program of China (2015CB755500)
National Natural Science Foundation of China (81601452)
Natural Science Foundation of Beijing Municipality (7174295)
Key science and technology research project of the Hebei provincial health and Family Planning Commission (20171258)
Article History
Received: 13 November 2017
Accepted: 27 February 2018
First Online: 19 March 2018
Compliance with ethical standards
:
: We report no conflict of interest concerning the materials or methods used in this study or the findings specified in this paper.
: This retrospective study was approved by the institutional review board of Beijing Tiantan hospital, written consent was obtained from all of our enrolled patients.