Received: 28 October 2020
Accepted: 5 May 2021
First Online: 7 June 2021
: This is a retrospective descriptive study approved by the Domain Specific Review Board (DSRB) under National Healthcare Group (No# 2018/01269), Singapore. Waiver of consent was applicable due to the retrospective nature of the study.
: Not applicable.
: No potential conflicts of interest with respect to the research, authorship, and publication of the article.