Degree of concordance between double-balloon enteroscopy and capsule endoscopy in obscure gastrointestinal bleeding: a multicenter study - Marmo, R.; Rotondano, G.; Casetti, T.; Manes, G.; Chilovi, F.; Sprujevnik, T.; Bianco, M. A.; Brancaccio, M. L.; Imbesi, V.; Benvenuti, S.; Pennazio, M. (Endoscopy, 2009)