Patients’ and physicians’ perspectives on opioid therapy for chronic cancer and musculoskeletal pain in Germany,Italy, and Turkey: PAin RESearch (PARES) survey
1. Regional Pain and Palliative Care Centre DGSG?ppingenGermany;2. SGS Life Science Services–Clinical ResearchMechelenBelgium;3. Janssen-Cilag GmbHNeussGermany;4. Palliative Care and Pain Therapy Unit, University Hospital of CareggiFlorenceItaly