Hu, Fei
Shang, Xifu
Zhang, Xianzuo
Chen, Min
Article History
Received: 20 July 2019
Accepted: 4 December 2019
First Online: 3 January 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This retrospective study was conducted in compliance with the Helsinki Declaration and was approved by Anhui Provincial Hospital review board.
: Informed consent was obtained from all individual participants included in the study.