[1] Yale Sch Med, 300 George St, New Haven, CT 06511 USA
[2] Univ Milano Bicocca, Dept Med & Surg, Monza, Italy
[3] Univ Appl Sci & Arts Southern Switzerland, Methodol & Stat Lab LABStat, Dept Business Econ, Hlth & Social Care, Manno, Switzerland
[4] Cent North West London NHS Fdn Trust, NPGC, Natl Problem Gambling Clin, London, England
[5] Yale Sch Med, Dept Psychiat, 300 George St,Suite 901, New Haven, CT 06511 USA
[6] Yale Sch Med, Dept Neurosci, Ctr Child Study, Natl Ctr Addict & Subst Abuse,Connecticut Mental, 300 George St,Suite 901, New Haven, CT 06511 USA
[7] San Gerardo Hosp, Dept Mental Hlth, Monza, Italy
[8] Imperial Coll London, Dept Med, London, England