In the original publication of this manuscript some funding support information was not included.
The funding support information has been updated in both the online PDF and HTML versions of this manuscript to the following:
‘This work was supported, in whole or in part, by the Bill & Melinda Gates Foundation [INV-005460]. Under the grant conditions of the Foundation, a Creative Commons Attribution 4.0 Generic License has already been assigned to the Author Accepted Manuscript version that might arise from this submission.’
The authors apologise for this error.