By Trudy Harpham, etc., Tim Lusty (Senior Health Adviser to OXFAM), Patrick Vaughan (Head, Evaluation and Planning Centre for Health Care, London School of Hygiene and Tropical Medicine)
By John Playfair (Emeritus Professor of Immunology, University College London Medical School), Gregory Bancroft (Department of Immunology and Infection, London School of Hygiene and Tropical Medicine)