1 Addictive Behaviors Unit, Clinical Neuroscience Institute, Hospital Clínic de Barcelona, Spain; Department of Psychiatry and Clinical Psychology, Hospital Clínic de Barcelona, Spain; Grup de Recerca en Addiccions Clínic, IDIBAPS, Universitat de Barcelona, Red de Trastornos adictivos (RETICS), Barcelona, Spain.
2 Addictive Behaviors Unit, Clinical Neuroscience Institute, Hospital Clínic de Barcelona, Spain; Department of Psychiatry and Clinical Psychology, Hospital Clínic de Barcelona, Spain; Grup de Recerca en Addiccions Clínic, IDIBAPS, Universitat de Barcelona, Red de Trastornos adictivos (RETICS), Barcelona, Spain. Electronic address: coliveras@clinic.cat.