About the Authors
Microbiology Unit, Laboratoire National de Santé, Luxembourg, Luxembourg
Centre de Recherche Public Santé, Luxembourg, Luxembourg
Center for Statistics, Hasselt University, Diepenbeek, Belgium
Modelling and Economics Unit, Health Protection Agency Centre for Infections, London, United Kingdom
Unit Health Economic and Modeling Infectious Diseases, Center for the Evaluation of Vaccination, Vaccine & Infectious Disease Institute, University of Antwerp, Antwerp, Belgium
Department of Vaccines, National Public Health Institute KTL, Helsinki, Finland
School of Public Health, University of Bielefeld, Bielefeld, Germany
Istituto Superiore di Sanità, Rome, Italy
Department of Mathematics, University of Rome Tor Vergata, Rome, Italy
Centre for Infectious Disease Control Netherlands, National Institute for Public Health and the Environment, Bilthoven, The Netherlands
National Institute of Hygiene, Warsaw, Poland
The authors have declared that no competing interests exist.
JM, NH, MJ, JW, and WJE drafted the manuscript in consultation with all the other authors; the original idea and contact diary were conceived by WJE. JM conducted a pilot study on an adapted diary, and coordinated overall survey design and data collection. JM, MJ, PB, KA, RM, MM, GST, JW, JH, MST, and MR conducted the surveys in their respective countries. NH conducted the data mining and surface smoothing. JW and JH conducted the epidemic modelling. All authors approved the final manuscript.