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Céspedes Martínez, E., Robles, V., Miarons, M., Herrera-De Guise, C., Mayorga-Ayala, L., Perez, Z., Oller, E., Casellas, F., & Borruel, N. (n.d.). p322 Effectiveness of Tumor Necrosis Factor-alpha inhibitors and Thiopurines combination therapy according to, 6-thioguanine nucleotides plasma levels: A Systematic Review. Journal of Crohn's and colitis, 16, i345. http://access.bl.uk/ark:/81055/vdc_100150514346.0x00000a