Xu, Jie
Liu, Ying
Wang, Anxin
Gao, Yuan
Wang, Yilong
Wang, Yongjun
Article History
Received: 3 September 2018
Revised: 23 April 2019
Accepted: 23 May 2019
First Online: 26 August 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The trial was approved by the Ethics Committee of Beijing Tiantan Hospital. Written informed consent was obtained from all participants or their legal proxies.
: Not commissioned; externally peer reviewed.