Wu, Jian
Ji, Qian Qian
Lin, Cai Xia
Du, Yi Fan
Li, Jia Ying
Cao, Kai
Wang, Ning Li
,
Article History
Received: 6 November 2020
Revised: 29 March 2021
Accepted: 3 May 2021
First Online: 16 June 2021
Declarations
:
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This study obtained the ethical clearance from the Beijing Tongren Hospital Ethical Committee, according to the Helsinki Declaration. Written informed consent was obtained from all participants. For those who were illiterate or blind, we read the consent form to them and asked them to mark the consent form with an inked forefinger, and the consent form with an inked forefinger that was obtained from illiterate participants was also approved by the Ethics committee.
: Not applicable.
: The authors declare no competing interests.