Joël Billieux1, Pierre Maurage2. 1. Institute of Psychology, University of Lausanne, Lausanne, Switzerland; Centre for Excessive Gambling, Lausanne University Hospitals (CHUV), Lausanne, Switzerland. Electronic address: joel.billieux@unil.ch. 2. Louvain Experimental Psychopathology Research Group (LEP), Psychological Sciences Research Institute, UCLouvain, Louvain-la-Neuve, Belgium.