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Therapeutic drug monitoring in inflammatory bowel diseases. Position statement of the Spanish Working Group on Crohn¿s Disease and Ulcerative Colitis Francisco Rodríguez-Moranta; Federico Argüelles-Arias; Joaquín Hinojosa del Val; Marisa Iborra Colomino; M. Dolores Martín-Arranz; Luis Menchén Viso; Fernando Muñoz Núñez; Elena Ricart Gómez; José Germán Sánchez-Hernández; Teresa Valdés-Delgado; Jordi Guardiola Capón; Manuel Barreiro-de Acosta; Míriam Mañosa Ciria; Yamile Zabana Abdo; Ana Gutiérrez Casbas;