Cohen Ted, Corbett Elizabeth L
Division of Global Health Equity, Brigham and Women's Hospital, and Center for Communicable Disease Dynamics and Department of Epidemiology, Harvard School of Public Health, Boston MA 02115, USA.
Lancet. 2011 Jul 16;378(9787):204-6. doi: 10.1016/S0140-6736(11)60896-9.