Affiliation: | 1. Department of Radiation Therapy, Hospital of the University of Pennsylvania, Philadelphia, PA USA;1. Center for Empirical Research in Economics and Behavioral Sciences, University of Erfurt, Germany;2. Department of Paediatrics, Dalhousie University, Canadian Centre for Vaccinology, IWK Health Centre, Halifax, Canada;3. World Health Organization, Regional Office for Europe, Copenhagen, Denmark |