1 World Health Organization, Infection Prevention and Control Global Unit, Department of Service Delivery and Safety, 1211 Geneva 27, Switzerland. Electronic address: allegranzib@who.int.
2 World Health Organization, Infection Prevention and Control Global Unit, Department of Service Delivery and Safety, 1211 Geneva 27, Switzerland.
3 Division of Healthcare Quality Promotion, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA.
4 Department of Non-communicable Disease Epidemiology, London School of Hygiene & Tropical Medicine, London, UK.