Duodenal metastasis of malignant melanoma observed by magnification endoscopy - Tanaka, K.; Toyoda, H.; Hamada, Y.; Aoki, M.; Kosaka, R.; Noda, T.; Katsurahara, M.; Nakamura, M.; Ninomiya, K.; Inoue, H.; Imoto, I. (Endoscopy, 2008)