1. Gastroenterologists' Perceived Barriers to Optimal Pre-Colonoscopy Bowel Preparation: Results of a National Survey Hillyer, Grace A.; Basch, Corey H.; Basch, Charles E.; Lebwohl, Benjamin; Kastrinos, Fay; Insel, Beverly J.; Neugut, Alfred I. 2012 Articles OncologyEpidemiologyMedicine