1. Watanabe H, Shirai Y, Kijima H, et al. Characteristics of early carcinoma of the gallbladder (in Japanese). Kan Tan Sui (Liver · Biliary tract · Pancreas) 1985;10:527–534.
2. Watanabe H, Kijima H, Uchida K, et al. Definition and morphological characteristics of early carcinoma of the gallbladder (in Japanese with English abstract). Stomach Intestine 1986;21:483–495.
3. Shimada S, Ariyama J, Shirakabe H. Gallbladder carcinoma: Diagnosis, treatment and clinico-pathological study of resectable tumor (in Japanese with English abstract). Stomach Intestine 1986;21:529–537.
4. Ogoshi K, Niwa M. Clinical evaluation of ERCP in the diagnosis of early cancer of the gallbladder (in Japanese with English abstract). Stomach Intestine 1986;21:521–527.
5. Inui K, Nakazawa S, Naito Y, et al. Diagnostic imaging system for precise diagnosis of spread of carcinoma of the gallbladder with new procedures; EUS, PTCCS and PTDCC (in Japanese with English abstract). Stomach Intestine 1987;22:541–548.