Lee, Gyeongsil
Jeong, Seogsong
Choi, Seulggie
Kim, Kyae Hyung
Chang, Jooyoung
Kim, Seong Rae
Kim, Kyuwoong
Son, Joung Sik
Kim, Sung Min
Choi, Daein
Park, Sang Min
Article History
Received: 9 March 2021
Accepted: 25 May 2021
First Online: 16 June 2021
Declarations
:
: This study was conducted according to the guidelines in the Declaration of Helsinki and approved by Seoul National University’s Institutional Review Board (approval number: E-2004-191-1119). The requirement for informed consent was waived by the review board, as the NHIS database is anonymized by strict confidentiality guidelines.
: Not applicable.
: The authors declare that they have no competing interests.