- Correspondence to Dr Steven P Cohen, Anesthesiology, Pain Medicine Division, Johns Hopkins School of Medicine, Baltimore, MD 21205, USA;
- Received December 21, 2019
- Revision received February 7, 2020
- Accepted February 11, 2020
- First published April 3, 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.