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Semmelweis Univ, Asklepios Hosp Barmbek, Fac Med, Dept Gastroenterol & Intervent Endoscopy, D-22291 Hamburg, Germany Semmelweis Univ, Asklepios Hosp Barmbek, Fac Med, Dept Gastroenterol & Intervent Endoscopy, D-22291 Hamburg, Germany