Systematic Review and External Validation of Prediction Models Based on Symptoms and Biomarkers for Identifying Endoscopic Activity in Crohn's Disease von Brand, Eelco C., Elias, Sjoerd G., Minderhoud, Itta M., van der Veen, Julius J., Baert, Filip J., Laharie, David, Bossuyt, Peter, Bouhnik, Yoram, Buisson, Anthony, Lambrecht, Guy, Louis, Edouard, Pariente, Benjamin, Pierik, Marieke J., van der Woude, C. Janneke, D’Haens, Geert R.A. M., Vermeire, Séverine, Oldenburg, Bas

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