The difficulties in establishing a birth order or maternal age effect in ankylosing spondylitis: comment on the article by Baudoin et al.
James
William H
WH
University College London, London, UK.
D001722:Birth Order; D005192:Family Health; D006801:Humans; D008423:Maternal Age; D009679:Nuclear Family; D013167:Spondylitis, Ankylosing / Q000503:physiopathology*