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Wanders, A., R. Landewe, A. Spoorenberg, K. de Vlam, H. Mielants, M. Dougados, S. van der Linden, e D. van der Heijde. Scoring of Radiographic Progression in Randomised Clinical Trials in Ankylosing Spondylitis: A Preference for Paired Reading Order. 2004.

Wanders, A., et al. Scoring of Radiographic Progression in Randomised Clinical Trials in Ankylosing Spondylitis: A Preference for Paired Reading Order. 2004.