2.1. Data source

YL Yi-Chun Liu
PN Phung-Anh Nguyen
AH Ayesha Humayun
SC Shuo-Chen Chien
HY Hsuan-Chia Yang
RA Rahma Novita Asdary
SS Shabbir Syed-Abdul
MH Min-Huei Hsu
MM Max Moldovan
YY Yun Yen
YL Yu-Chuan (Jack) Li
WJ Wen-Shan Jian
UI Usman Iqbal
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In this study, we used the Taiwan National Health Insurance Research Database (NHIRD), which was established by the Taiwan's National Health Research Institute. The NHIRD consists of detailed claim data for more than 23 million enrollees, covering 99% of Taiwanese residents.[13] From this population-wide database, we randomly selected a 2 million sample covering years 1998 to 2009, inclusively.[14] The data were anonymized and de-identified prior to our analysis; hence, this type of study did not require the Institutional Review Board approval.

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