Prevalence of mid-gastrointestinal bleeding in patients with acute overt gastrointestinal bleeding: multi-center experience with 1,044 consecutive patients.
Okazaki H, Fujiwara Y, Sugimori S, Nagami Y, Kameda N, Machida H, Yamagami H, Tanigawa T, Shiba M, Watanabe K, Tominaga K, Watanabe T, Oshitani N, Arakawa T.