机译:Opioids for chronic osteoarthritis pain: An updated systematic review and meta‐analysis of efficacy, tolerability and safety in randomized placebo‐controlled studies of at least 4 weeks double‐blind duration
Health Care Center for Pain Medicine and Mental HealthSaarbrücken,Germany;
Pain MedicineUniversity Medical Center G?ttingenG?ttingen,Germany;
Department Internal and Integrative MedicineUniversity of Duisburg‐EssenEssen,Germany;