Funding for this research was provided by:
Youth foundation of Beijing Shijitan Hospital (2018-q13)
Project of Science and Technology Research and Development of China Railway Corporation (J2017Z602)
Project of Science and Technology Research and Development of China Railway Corporation (J2017Z603)
Received: 26 May 2020
Accepted: 8 March 2021
First Online: 28 April 2021
: This study has been approval by Institutional Review Board (IRB) of Ethics Committees at Beijing Shijitan Hospital (2019 No 31). The Declaration of Helsinki principles have been according to in this study. In addition, written informed consent was obtained from participants before the data collection.
: Not applicable.
: The authors declare that they have no competing interests.