1. 1 Department of Psychiatry and Psychotherapy, University of Lübeck, Lübeck, Germany
2. 2 Department of Mental Health and Psychiatry, Service of Addictology, Geneva University Hospitals, Geneva, Switzerland
3. 3 Geneva WHO Collaborating Center for Training and Research, University of Geneva, Geneva, Switzerland
4. 4 Addictive and Compulsive Behaviours Lab, Institute for Health and Behaviour, University of Luxembourg, Esch-sur-Alzette, Luxembourg
5. 5 Central North West London NHS Trust, Division of Brain Science, Imperial College London, London, UK
6. 6 Department of Mental Health and Substance Abuse, WHO Headquarters, Geneva, Switzerland
7. 7 Institute of Psychology, Eötvös Loránd University (ELTE), Budapest, Hungary
8. 8 National Hospital Organization Kurihama Medical and Addiction Center, Yokosuka, Kanagawa, Japan
9. 9 School of Psychology, The University of Adelaide, Adelaide, SA, Australia
10. 10 Central Institute of Mental Health, University of Heidelberg, Mannheim, Germany
11. 11 Department of Psychiatry and Neuroscience, Child Study Center, The National Center on Addiction and Substance Abuse, Connecticut Mental Health Center, Yale University School of Medicine, New Haven, CT, USA
12. 12 Centre for Youth Substance Abuse Research, The University of Queensland, Brisbane, QLD, Australia
13. 13 Faculty of Health and Environmental Sciences, Auckland University of Technology, Auckland, New Zealand
14. 14 Department of Psychiatry, National Drug Dependence Treatment Centre, All India Institute of Medical Sciences, New Delhi, India
15. 15 Department of Psychology, Hasan Kalyoncu University, Gaziantep, Turkey
16. 16 Epidemiology Unit and Centre for Alcohol Studies, Faculty of Medicine, Prince of Songkla University, Hat Yai, Songkhla, Thailand
17. 17 Department of Psychiatry and Mental Health, Hospital Selayang, Selangor, Malaysia
18. 18 National Institute of Psychiatry, Mexico City, Mexico
19. 19 General Psychology: Cognition Center for Behavioral Addiction Research, University Duisburg-Essen, Duisburg, Germany
20. 20 Erwin L. Hahn Institute for Magnetic Resonance Imaging, Essen, Germany
21. 21 Integrated Centre on Addiction Prevention and Treatment, Tung Wah Group of Hospitals, Hong Kong SAR, China
22. 22 Department of Health, Hong Kong SAR, China
23. 23 Applied Child Psychology and Department of Psychiatry, McGill University, Montreal, Canada
24. 24 National Rehabilitation Center, Abu Dhabi, United Arab Emirates
25. 25 National Drug and Alcohol Research Centre, University of New South Wales, Randwick, NSW, Australia
26. 26 Hertfordshire Partnership University NHS Foundation Trust, Hertfordshire, UK
27. 27 Department of Postgraduate Medicine, University of Hertfordshire, Hertfordshire, UK
28. 28 National Centre on Addiction and Doping, National Observatory on Alcohol, Italian National Institute of Health, Rome, Italy
29. 29 Department of Psychology, Iowa State University, Ames, IA, USA
30. 30 International Gaming Research Unit, Psychology Department, Nottingham Trent University, Nottingham, UK
31. 31 Department of Psychiatry, Academic Medical Center, Mental Health Care, University of Amsterdam, Amsterdam, The Netherlands
32. 32 Addictology and Psychiatry Department, CHU Nantes, Nantes, France
33. 33 Mental Health Institute of the Second Xiangya Hospital, Central South University, Changsha, Hunan, China
34. 34 Department of Psychology, The University of Calgary, Calgary, Alberta, Canada
35. 35 Li Ka Shing Faculty of Medicine, Department of Paediatrics & Adolescent Medicine, The University of Hong Kong, Hong Kong SAR, China
36. 36 Department of Psychiatry, College of Medicine, The Catholic University of Korea, Seoul, South Korea
37. 37 Center for Research on Children, Adolescents, and the Media, Amsterdam School of Communication Research, University of Amsterdam, Amsterdam, The Netherlands
38. 38 Department of Psychiatry, University of Connecticut School of Medicine, Farmington, CT, USA
39. 39 Iranian National Center for Addiction Studies, Tehran University of Medical Sciences, Tehran, Iran
40. 40 Criminological Research Institute Lower Saxony, Hannover, Germany
41. 41 Institute for Mental Health Policy Research, Centre for Addictions and Mental Health, Toronto, Canada
42. 42 Department of Psychiatry, Faculty of Medicine, Institute of Medical Science, Dalla Lana School of Public Health, University of Toronto, Toronto, Canada
43. 43 Epidemiological Research Unit, Institute of Clinical Psychology and Psychotherapy, Technical University Dresden, Dresden, Germany
44. 44 National Observatory on Alcohol, National Institute of Health, Rome, Italy
45. 45 National Institute of Mental Health and Neurosciences, Bengaluru, India
46. 46 Study Group on Technological Addictions, Porto Alegre, Brazil
47. 47 Department of Psychiatry and Mental Health, SA MRC Unit on Risk & Resilience in Mental Disorders, University of Cape Town, Cape Town, South Africa
48. 48 Network for Internet Investigation and Research in Australia, The Delta Clinic, Sydney, NSW, Australia
49. 49 Department of Behavioral Science, University of Ariel, Ariel, Israel
50. 50 Outpatient Clinic for Behavioral Addiction, Department of Psychosomatic Medicine and Psychotherapy, University Medical Center, Johannes Gutenberg University, Mainz, Germany