Received: 19 August 2019
Revised: 3 July 2020
Accepted: 4 August 2020
First Online: 19 August 2020
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: This study was approved by the Ethic Review Committee and Academic Committee of Xi’an Jiaotong University Health Science Center (Approval No. 2012008).
: Written informed consent was obtained from all participants.