- Correspondence to Dr Ban C H Tsui, Anesthesiology, Perioperative and Pain Medicine, Stanford University, Palo Alto, CA 94305, USA;
- Received November 17, 2019
- Revision received February 29, 2020
- Accepted March 4, 2020
- First published April 21, 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.