title: Physicians are the primary source of opioids for chronic abusers.
mesh_terms: D000701:Analgesics, Opioid / Q000008:administration & dosage / Q000009:adverse effects*; D002908:Chronic Disease; D006801:Humans; D009293:Opioid-Related Disorders / Q000453:epidemiology*; D010818:Practice Patterns, Physicians' / Q000706:statistics & numerical data*; D063487:Prescription Drug Misuse / Q000706:statistics & numerical data; D014481:United States / Q000453:epidemiology
chemical_list: D000701:Analgesics, Opioid