This study adhered to the standards of the Declaration of Helsinki and current ethical guidelines. Ethical approval was obtained by the institutional review board of the Faculty of Medicine, Prince of Songkla University and Songklanagarind Hospital (REC.65-317-7-1). The requirement for informed consent for this study was waived by the Institutional Review Board of the Faculty of Medicine, Prince of Songkla University and Songklanagarind Hospital as the study was a retrospective study.
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