Li, Yan
Qin, Li
Bai, Qijun
Zhang, Jingjing
Chen, Ruixue
Song, Kunpeng
Article History
Received: 7 December 2020
Accepted: 3 February 2021
First Online: 16 February 2021
Ethics approval and consent to participate
: The study protocol was approved by Ethical Committee of Zhengzhou Central Hospital Affiliated to Zhengzhou University, and was conformed to the ethical guidelines of the 1975 Declaration of Helsinki (6th revision, 2008). Informed consents were obtained from all enrolled subjects or legal guardians.
: Not applicable.
: The authors declare that they have no competing interests.