Familial adenomatous polyposis associated with gastrointestinal stromal tumor: Report of a case - BAŞSORGUN, Cumhur İbrahim; ÖZBUDAK, İrem Hicran; ERDOĞAN, Gülgün; ELPEK, Gülsüm Özlem; ERDOĞAN, Okan; GELEN, Tekinalp (Turkish Journal of Gastroenterology, 2012)