1 Institute of Psychology, University of Lausanne, Lausanne, Switzerland.
2 Institute of Psychology, University of Lausanne, Lausanne, Switzerland; University of León, León, Spain; Faculty of Psychology, University of Santiago de Compostela, Santiago de Compostela, Spain.
3 Inserm UMR-S 1144, Université de Paris, Paris, France; Université de Lorraine, APEMAC, EPSAM, Metz, France.
4 Institute of Psychology, University of Lausanne, Lausanne, Switzerland; Centre for Excessive Gambling, Addiction Medicine, Lausanne University Hospitals (CHUV), Lausanne, Switzerland. Electronic address: joel.billieux@unil.ch.