John G Meara1, Andrew J M Leather2, Paul E Farmer3. 1. Program in Global Surgery and Social Change, Harvard Medical School, Boston, MA 02115, USA; Boston Children's Hospital, Boston, MA, USA. Electronic address: john.meara@childrens.harvard.edu. 2. King's Centre for Global Health and Health Partnerships, King's College London, London, UK. 3. Department of Global Health and Social Medicine, Harvard Medical School, Boston, MA 02115, USA.