1. Alliance for Health Policy and Systems Research, World Health Organization, avenue Appia 20, 1211 Geneva 27, Switzerland.
2. School of Public Health and Family Medicine, University of Cape Town, Cape Town, South Africa.
3. Department of Learning, Informatics, Management and Ethics (LIME), Karolinska Institutet, Solna, Sweden.
4. Radboud Institute for Health Sciences, Radboud University Medical Center, Nijmegen, Netherlands.
5. Division of Infectious Disease Control, Norwegian Institute of Public Health: Oslo, Norway.