- Correspondence to Elena Pallari, MRC Clinical Trials Unit at UCL, London WC1V 6LJ, UK;
- Received November 1, 2019
- Revised January 9, 2020
- Accepted January 10, 2020
- First published March 30, 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.