1 Warwick Medical School, University of Warwick, Coventry, CV4 7AL, UK.
2 Institute of Applied Health Research, College of Medical and Dental Sciences, University of Birmingham, B15 2TT, Birmingham, UK.
3 College of Medicine and Allied Health Sciences, University of Sierra Leone, Freetown, Western Area, Sierra Leone.
4 School of Community Health Sciences, Njala University, Bo Campus, Bo, Sierra Leone.
5 Mercy Hospital Research Laboratory, Bo, Sierra Leone.
6 AGE Research Group, NIHR Newcastle Biomedical Research Centre, Newcastle University, Newcastle upon Tyne, UK.
7 Newcastle upon Tyne Hospitals Trust, Newcastle upon Tyne, UK.
8 MRC/Wits Rural Public Health & Health Transitions Research Unit (Agincourt), University of the Witwatersrand, Johannesburg, South Africa.
9 Institute of Applied Health Research, College of Medical and Dental Sciences, University of Birmingham, B15 2TT, Birmingham, UK. [email protected].
10 MRC/Wits Rural Public Health & Health Transitions Research Unit (Agincourt), University of the Witwatersrand, Johannesburg, South Africa. [email protected].
11 Department for Global Health, Centre for Global Surgery, Stellenbosch University, Stellenbosch, South Africa. [email protected].