A 26 week randomised, double blind, placebo controlled exploratory study of sulfasalazine in juvenile onset spondyloarthropathies. Issue 10 (1st October 2002) - Burgos-Vargas, R; Vázquez-Mellado, J; Pacheco-Tena, C; Hernández-Garduño, A; Goycochea-Robles, M V