Perceived high risk of COVID-19 vaccination: the revealing power of placebo.Beyens Michiel1,2; Toscano Alessandro1,2; Van Damme Pierre3; Dogné Jean-Michel4; Ebo Didier1,2,5*; Sabato Vito1,2,51 Department of Immunology, Allergology, Rheumatology and the Infla-Med Centre of Excellence, Faculty of Medicine and Health Sciences, University of Antwerp, Antwerp, Belgium2 Immunology, Allergology, Rheumatology, Antwerp University Hospital, Antwerp, Belgium3 Centre for the Evaluation of Vaccination and Vaccine & Infectious Disease Institute, University of Antwerp, Antwerp, Belgium.4 Department of Pharmacy, Namur Research Institute for LIfe Sciences, University of Namur, Namur, Belgium.5 Immunology and Allergology, AZ Jan Palfijn Gent, Ghent, Belgium