Tjallie van der Kooi and Hugo Sax contributed equally to the work

RIVM National Institute for Public Health and the Environment, Bilthoven, The Netherlands

Tjallie van der Kooi, Sabine de Greeff & Jaap van Dissel

Division of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, Rämistrasse 100, 8091, Zurich, Switzerland

Hugo Sax, Lauren Clack & Walter Zingg

Medical Center – University of Freiburg, Freiburg, Germany

Hajo Grundmann

University of Geneva Hospitals, Geneva, Switzerland

Didier Pittet

WHO Collaborating Centre on Infection Prevention and Control and Antimicrobial Resistance, Geneva, Switzerland

Didier Pittet & Walter Zingg

Center for Health Services and Outcomes Research, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD, USA

Albert W. Wu

Galway University Hospital, Galway, Ireland

Judith Davitt

Evangelismos Hospital, Athens, Attica, Greece

Sofia Kostourou & Fani Veini

St. Michaels Hospital, Dún Laoghaire, Ireland

Alison Maguinness

Faculty of Health Sciences, University of Bielsko-Biala, Bielsko-Biala, Poland

Anna Michalik

Emergency Institute for Cardiovascular Diseases “Prof. C.C. Iliescu”, Bucharest, Romania

Viorica Nedelcu

Bács-Kiskun Megyei Kórház (County Teaching Hospital), Kecskemet, Hungary

Márta Patyi & Éva Varga

University Medical Centre Ljubljana, Ljubljana, Slovenia

Janja Perme Hajdinjak & Milena Prosen

Hospital Vall d’Hebron, Barcelona, Catalunya, Spain

David Tellez

John Paul II Hospital, Kraków, Poland

Mirosław Ziętkiewicz

Medical College Jagiellonian University, Kraków, Poland

Mirosław Ziętkiewicz

Department of Infectious Diseases, Bern University Hospital and University of Bern, Bern, Switzerland

Hugo Sax