title: Early spondyloarthritis in an HLA-B27-positive monozygotic twin pair: A highly concordant onset, sites of involvement, and disease course.
authors.forename: Ulrich
authors.initials: U
authors.lastname: Weber
authors.forename: Christian W A
authors.initials: CW
authors.lastname: Pfirrmann
authors.forename: Rudolf O
authors.initials: RO
authors.lastname: Kissling
authors.forename: C Ronald
authors.initials: CR
authors.lastname: Mackenzie
authors.forename: Muhammad A
authors.initials: MA
authors.lastname: Khan
mesh_terms: D000328:Adult; D015796:HLA-B27 Antigen; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D010384:Pelvic Bones / Q000473:pathology*; D012446:Sacroiliac Joint / Q000473:pathology*; D013167:Spondylitis, Ankylosing / Q000175:diagnosis / Q000235:genetics*; D014430:Twins, Monozygotic
chemical_list: D015796:HLA-B27 Antigen