1. Institute of Tropical Medicine and International Health at Charité – Universitätsmedizin, Berlin, Germany.
2. Infection Control Programme and World Health Organization Collaborating Centre on Patient Safety, University of Geneva Hospitals and Faculty of Medicine, 4 Rue Gabrielle Perret-Gentil, 1211 Geneva 14, Switzerland.
3. Harvard School of Public Health, Boston, United States of America.
4. Patient Safety, World Health Organization, Geneva, Switzerland.