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Alvaro-Gracia JM, Humbria A, García-Vicuña R, Ariza A, García-Vadillo A, Laffón A.Alvaro-Gracia JM, et al. Among authors: laffon a.J Rheumatol. 1989 Nov;16(11):1486-8.J Rheumatol. 1989.PMID: 2600948
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