1. Centro per la Prevenzione e Cura del Tabagismo (CPCT), Azienda Ospedaliero-Universitaria “Policlinico-V. Emanuele”, Università of Catania, Catania, Italy
2. Center of Excellence for the acceleration of HArm Reduction (CoEHAR), University of Catania, Catania, Italy
3. Canadian Institute for Substance Use Research, Victoria, Canada
4. David Geffen School of Medicine at the University of California, Los Angeles (UCLA), Los Angeles, CA, USA
5. Dipartimento di Medicina Clinica e Sperimentale (MEDCLIN), University of Catania, Catania, Italy
6. Dipartimento di Scienze biomediche e biotecnologiche (BIOMETEC), University of Catania, Catania, Italy