- Correspondence to Dr Jakob Petersen, London School of Hygiene and Tropical Medicine, London WC1E 7HT, UK;
- Received November 21, 2019
- Revised March 4, 2020
- Accepted April 14, 2020
- First published May 4, 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.