Quantitative Analysis of Red Color Sign in the Endoscopic Evaluation of Esophageal Varices - Ichikawa, S.; Okamura, S.; Tujigami, K.; Kusaka, Y.; Tadatsu, M.; Okita, Y.; Tsutsui, A.; Muguruma, N.; Okahisa, T.; Shibata, H.; Shimizu, I.; Ito, S.; Umino, K. (Endoscopy, 2001)