Iwagami, Masao http://orcid.org/0000-0001-7079-0640
Kumazawa, Ryosuke
Miyamoto, Yoshihisa
Ito, Yuri
Ishimaru, Miho
Morita, Kojiro
Hamada, Shota
Tamiya, Nanako
Yasunaga, Hideo
Article History
Accepted: 13 November 2020
First Online: 27 November 2020
Declarations
:
: No funding was received for the conduct of this study or the preparation of this article.
: Masao Iwagami, Ryosuke Kumazawa, Yoshihisa Miyamoto, Yuri Ito, Miho Isihmaru, Kojiro Morita, Shota Hamada, Nanako Tamiya, and Hideo Yasunaga have no conflicts of interest that are directly relevant to the content of this article.
: The data were obtained from the Japan Medical Data Center (JMDC) Co., Ltd. (Tokyo, Japan). The JMDC data governance does not allow us to distribute patient data to other parties. Researchers may apply for data access at . The codes used to define the exposure, outcome, and covariates for this study are provided in the Electronic Supplementary Material.
: This study was approved by the Institutional Review Board of The University of Tokyo.
: The need for informed consent was waived because of the anonymous nature of the data.
: Patient privacy and confidentiality were preserved because each individual’s identifier was removed at the time of the database creation.
: STATA Version 16 (StataCorp, College Station, TX, USA) is commercially available. A custom code is available from the corresponding author on reasonable request.
: Masao Iwagami planned the study, conducted the analysis, and wrote the first draft of the manuscript. Ryosuke Kumazawa, Yoshihisa Miyamoto, Miho Isihmaru, and Kojiro Morita extracted the data and assisted with the data analysis. Yuri Ito, Shota Hamada, and Nanako Tamiya assisted with the interpretation of the results and writing of the manuscript. Hideo Yasunaga supervised the study and assisted with the writing of the manuscript. All authors have read and approved the final manuscript.