1. ReBUILD Programme, Institute for International Health and Development, Queen Margaret University, Musselburgh, Edinburgh, EH21 6UU, UK, 2Ministry of Health and Sanitation, Youyi Building, Brookfields, Freetown, Sierra Leone and 3Nuffield Centre for International Health and Development, Leeds Institute for Health Sciences, 102 Clarendon Road, Leeds LS2 9JZ, UK