Godfrey Woelk, Karen Daniels, Julie Cliff, Simon Lewin, Esperança Sevene, Benedita Fernandes, Alda Mariano, Sheillah Matinhure, Andrew D Oxman, John N Lavis, Cecilia Stålsby Lundborg
Health Res Policy Syst. 2009; 7: 31. Published online 2009 December 30. doi: 10.1186/1478-4505-7-31