A case of early gastric cancer accompanied by a hamartomatous inverted polyp and successfully managed with endoscopic submucosal dissection - Ono, S; Kamoshida, T; Hiroshima, Y; Okawara, A; Matsuo, T; Kakinoki, N; Ishikawa, A; Kishimoto, Y; Hirai, S; Oka, Y; Shimokama, T (Endoscopy, 2007)