title: Reply to eLetter by Feldtkeller et al.
authors.affiliation: Centre for Applied Health Services Research, University of Southern Denmark, Odense, Denmark.
authors.forename: Jan
authors.initials: J
authors.lastname: Sørensen
authors.affiliation: DANBIO registry, Copenhagen Center for Arthritis Research, Center for Rheumatology and Spine Diseases, Glostrup Hospital, Glostrup, Denmark Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.
authors.forename: Merete Lund
authors.initials: ML
authors.lastname: Hetland
mesh_terms: D018501:Antirheumatic Agents / Q000627:therapeutic use*; D015535:Arthritis, Psoriatic / Q000175:diagnosis*; D001172:Arthritis, Rheumatoid / Q000175:diagnosis*; D057210:Delayed Diagnosis; D005260:Female; D006801:Humans; D008297:Male; D012107:Research Design / Q000592:standards*; D012219:Rheumatology / Q000639:trends*; D013167:Spondylitis, Ankylosing / Q000175:diagnosis* / Q000188:drug therapy* / Q000503:physiopathology*
chemical_list: D018501:Antirheumatic Agents
keywords: Disease Activity; Rheumatoid Arthritis; Treatment