- Correspondence to Dr John Ong, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore;
- Received March 18, 2020
- Revised March 23, 2020
- Accepted March 23, 2020
- First published April 2, 2020.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.