Ye, Wenling
Shu, Hong
Wen, Yubing
Ye, Wei
Li, Hang
Qin, Yan
Chen, Limeng
Li, Xuemei
Article History
Received: 4 December 2018
Accepted: 26 March 2019
First Online: 15 April 2019
Compliance with ethical standards
:
: All authors declare that they have no conflict of interest.
: The research protocol was approved by the Ethics Committee at PUMCH. All procedures performed in this study were in accordance with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards. For this type of study, formal consent was not required.