- Correspondence to Professor Christopher Burton, Academic Unit of Primary Medical Care, The University of Sheffield, Sheffield S10 2TN, UK;
- Received October 6, 2020
- Revised March 21, 2021
- Accepted April 6, 2021
- First published May 26, 2021.
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.