Nicola Magrini1, Jane Robertson2, Kees de Joncheere2, Lisa Bero3. 1. Essential Medicines List Secretariat, Essential Medicines and Health Products Department, World Health Organization, 1211 Geneva 27, Switzerland magrinin@who.int. 2. Essential Medicines List Secretariat, Essential Medicines and Health Products Department, World Health Organization, 1211 Geneva 27, Switzerland. 3. Medicines Use and Health Outcomes, Faculty of Pharmacy and Charles Perkins Centre, University of Sydney, Sydney, Australia.