In the original publication of this manuscript some funding support information was not included and one of the author names was spelled incorrectly.
These errors have been updated in both the online PDF and HTML versions of this manuscript.
The following statement has been added to the funding support information:
‘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 name appeared as ‘Hailemariam Teshome’ and has now been corrected to ‘Habtemariam Teshome’.
The authors apologise for these errors.