1 Department of Service Delivery and Safety, WHO, 1211 Geneva, Switzerland. Electronic address: allegranzib@who.int.
2 Department of Non-communicable Disease Epidemiology, London School of Hygiene and Tropical Medicine, London, UK.
3 Department of Service Delivery and Safety, WHO, 1211 Geneva, Switzerland.
4 Infection Control Programme and WHO Collaborating Centre on Patient Safety, Faculty of Medicine, Geneva University of Geneva Hospitals, Geneva, Switzerland.