1. Liverpool School of Tropical Medicine; Cochrane Infectious Diseases Group; Pembroke Place Liverpool UK L3 5QA
2. Chongqing Medical University; School of Public Health and Management; No. 1, Yi Xue Yuan Road Chongqing China 400016
3. Liverpool School of Tropical Medicine; Department of Clinical Sciences; Pembroke Place Liverpool UK L3 5QA
4. World Health Organization; UNICEF/UNDP/World Bank/WHO Special Programme for Research and Training in Tropical Diseases (TDR); 1211 Geneva 27 Geneva Switzerland