title: In reply.
authors.forename: Winfried
authors.initials: W
authors.lastname: Häuser
mesh_terms: D000701:Analgesics, Opioid / Q000008:administration & dosage* / Q000009:adverse effects*; D059350:Chronic Pain / Q000188:drug therapy*; D006261:Headache / Q000139:chemically induced* / Q000517:prevention & control*; D006801:Humans; D001523:Mental Disorders / Q000139:chemically induced*; D017410:Practice Guidelines as Topic
chemical_list: D000701:Analgesics, Opioid