title: [Why is Santa Claus bowed?].
authors.affiliation: Lundin yliopiston reumatologian laitos, S-22185 Lund, Sverige.
authors.forename: M
authors.initials: M
authors.lastname: Leirisalo-Repo
mesh_terms: D000368:Aged; D005843:Geography; D015796:HLA-B27 Antigen; D006801:Humans; D007738:Kyphosis / Q000453:epidemiology / Q000209:etiology*; D008297:Male; D013167:Spondylitis, Ankylosing / Q000453:epidemiology / Q000209:etiology*; D014925:Wit and Humor as Topic
chemical_list: D015796:HLA-B27 Antigen