Xie, Yan
Wang, Xiaopei
Leng, Xin
Zheng, Wen
Ping, Lingyan
Zhang, Chen
Liu, Weiping
Deng, Lijuan
Wu, Meng
Song, Yuqin
Funding for this research was provided by:
The Beijing Medical and Health Foundation (No.2221-16-157)
Article History
Received: 19 May 2019
Accepted: 26 September 2019
First Online: 24 January 2020
Compliance with ethical standards
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional 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.
: The authors declare that they have no conflict of interest.