title: Registries and biologics: disease populations matter.
authors.affiliation: Department of Dermatology, Hospital de la Santa Creu i Sant Pau, Universitat Autònoma de Barcelona, Sant Antoni Maria Claret 167, 08025, Barcelona, Catalonia, Spain.
authors.forename: L
authors.initials: L
authors.lastname: Puig
mesh_terms: D018501:Antirheumatic Agents; D001172:Arthritis, Rheumatoid; D001685:Biological Factors; D001688:Biological Products; D006801:Humans; D012042:Registries
chemical_list: D018501:Antirheumatic Agents; D001685:Biological Factors; D001688:Biological Products