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1Spanish Platform for Collaborative Research of the Spanish Association of Gastroenterology (AEG-REDCap), Madrid, Spain 2Gastroenterology Unit, Hospital Universitario de La Princesa and Instituto de Investigación Sanitaria Princesa (IIS-IP), Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD), Madrid, Spain 3Spanish Working Group on Crohn's Disease and Ulcerative Colitis (GETECCU), Madrid, Spain Correspondence: Javier P. Gisbert, MD, PhD, Gastroenteroloy Unit, Hospital Universitario de La Princesa and Instituto de Investigación Sanitaria Princesa (IIS-IP), Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD), Diego de León, 62, Madrid 28006, Spain. E-mail: [email protected] Guarantor of the article: Javier P. Gisbert, MD, PhD. Specific author contributions: Both authors contributed equally to the mansucript. Financial support: None. Potential competing interests: None.
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McNicholl et al. (2017) studied this question.
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