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Contributors YP and PS conceptualised and wrote the study protocol, performed the study, collected the data, and prepared the first draft and revised the manuscript. AS, JS and TS helped to perform the study, collected the data, reviewed and criticised this manuscript. CK served as a statistical consultant, selected the statistical analysis method and performed these analyses. PS conceptualised the study protocol, performed the study, criticised and revised the manuscript for intellectual content.
Funding This study was funded by the Siriraj Medical Research Center (grant no: Si 080/2018).
Competing interests None declared.
Patient consent for publication Obtained.
Provenance and peer review Not commissioned; externally peer reviewed.
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