Behavioural Addiction Open Definition 2.0-using the Open Science Framework for collaborative and transparent theoretical development.

Billieux J Institute for Health and Behaviour, University of Luxembourg, Luxembourg.
van Rooij AJ Trimbos Institute, Netherlands Institute of Mental Health and Addiction, Utrecht, the Netherlands.
Heeren A Department of Psychology, Harvard University, Cambridge, MA, USA.
Schimmenti A Faculty of Human and Social Sciences, Kore University of Enna, Enna, Italy.
Maurage P Laboratory for Experimental Psychopathology, Université Catholique de Louvain, Louvain, Belgium.
Edman J Centre for Social Research on Alcohol and Drugs, Stockholm University, Stockholm, Sweden.
Blaszczynski A Gambling Treatment Clinic and Research, School of Psychology, University of Sydney, Sydney, Australia.
Khazaal Y Geneva University Hospital, University of Geneva, Geneva, Switzerland.
Kardefelt-Winther D Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden.