Global health :diseases, programs, systems and policies / Michael H. Merson, MD, Wolfgang Joklik Professor of Global Health, Duke Global Health Institute, Duke University, Durham, North Carolina, Robert E. Black, MD, MPH, Profesor and Director, Institute for International Programs, Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, Anne J. Mills, PhD, Professor and Deputy Director and Provost, London School of Hygiene & Tropical Medicine, London, UK. - Fourth edition. - xxxiv, 958 pages : illustrations ; 29 cm