1. Mother and Infant Research Unit, School of Health Sciences, University of Dundee, Dundee, UK
2. Navrongo Health Research Centre, Ghana Health Service, Navrongo, Ghana
3. Kintampo Health Research Centre, Ghana Health Service, Kintampo, Ghana
4. Institute of Health Research, University of Health and Allied Sciences, Ho, Ghana
5. Institute of Health and Wellbeing, University of Glasgow, Glasgow, UK
6. Mailman School of Public Health, Columbia University, New York, NY, USA