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Contributors S-WL contributed to the conception of the article, initiated the draft of the article and has approved the final draft submitted. C-LL and K-FL conducted data analysis.
Competing interests None declared.
Patient consent for publication Not required.
Ethics approval Insurance reimbursement claims data used in this study were available for public access. Patient identification numbers were scrambled to ensure confidentiality. This study was approved by the Research Ethics Committee of China Medical University and Hospital in Taiwan (CMUH-104-REC2-115).
Provenance and peer review Not commissioned; externally peer reviewed.
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