1. Department of Drug Sciences, University of Catania, Catania, Italy;
2. Oasi Research Institute – IRCCS, Troina, Italy;
3. Department of Medical and Surgical Sciences and Biotechnologies, Sapienza University of Rome, Rome, Italy;
4. Anesthesiology and Intensive Care, University of L'Aquila, L'Aquila, Italy;
5. Supportive Care Center, MD Anderson Cancer Center, University of Texas, Houston, Texas, USA;
6. Main Regional Center for Pain Relief and Supportive/Palliative Care, La Maddalena Cancer Center, Palermo, Italy;
7. Clinica Ortopedica Università di Perugia, Umbria, Italy;
8. Department of Pharmacy and Biotechnology, Alma Mater Studiorum, University of Bologna, Bologna, Italy;
9. Grunenthal Medical Direction, Milan, Italy;
10. Division of Biosciences, UCL, London, UK