Received: 5 February 2021
Accepted: 26 April 2021
First Online: 8 May 2021
: This retrospective study used secondary data which was carried out by the approval and guidelines of the respective Institutional Ethics Committees, namely Clinical Research Management Committee of the First Affiliated Hospital of Fujian Medical University, Medical Ethics Committee of the Affiliated Hospital of Guizhou Medical University, Medical Ethics Committee of the Affiliated Hospital of Qingdao University, and Medical Research Ethics Committee of the First Affiliated Hospital of China Medical University that exempted the informed consent from the participants as all the criteria were met for a waiver of consent to be granted.
: All the authors agree to the publication of this original research work.
: The authors have no conflict of interest to declare.