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[This corrects the article DOI 10.3892/ol.2018.8006.]. The objective of this study was to analyze health outcomes, resource utilization, and costs in osteoarthritis patients with chronic nociceptive pain who began treatment with an opioid in real-world practice in Spain. We designed a non-interventional, retrospective, longitudinal study with 36 months of follow-up using electronic medical records (EMRs) from primary care centers, of patients aged 18+ years who began a new treatment with an opioid drug in usual practice for chronic pai