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, University College London, London, UK