Sheng, Song
Zhang, Yan-Hong
Ma, Hang-Kun
Huang, Ye
Article History
Received: 7 May 2021
Accepted: 29 November 2021
First Online: 2 February 2022
Declarations
:
: The original study was approved by the Yonsei University Health System Severance Hospital Institutional Review Board (No. 4–2016-1073). For our secondary study based on a public database, ethical approval was not required. A waiver of informed consent was obtained because of the nature of the study. This study conformed to the guidelines of the Helsinki Declaration.
: All the authors have declared no competing interest.
: Not applicable.