Received: 2 March 2020
Accepted: 20 March 2020
First Online: 3 April 2020
Change Date: 27 May 2020
Change Type: Correction
Change Details: An amendment to this paper has been published and can be accessed via a link at the top of the paper.
: B.J.C. consults for Roche and Sanofi Pasteur. The authors declare no other competing interests.
Free to read: This content has been made available to all.