Increased Duodeno-Gastro-Esophageal Reflux (DGER) in Symptomatic GERD Patients with a History of Cholecystectomy - Kunsch, S.; Neesse, A.; Huth, J.; Steinkamp, M.; Klaus, J.; Adler, G.; Gress, T. M.; Ellenrieder, V. (Zeitschrift für Gastroenterologie, 2009)