Qin, Ai-bo
Su, Tao
Wang, Su-xia
Zhang, Fan
Zhou, Fu-de
Zhao, Ming-hui
Article History
Received: 19 July 2018
Accepted: 6 June 2019
First Online: 20 June 2019
Ethics approval and consent to participate
: This study was in adherence with the Declaration of Helsinki and was approved by the ethics committee of Peking University First Hospital (approval number 2017[1280]). All these patients gave written informed consent before data collection.
: Not applicable.
: The authors declare that they have no competing interests.