1. Hirayama T: Prostate in comparative epidemiology of cancer in the U.S. and Japan. Tokyo JSPS p 26. 1978.
2. Raasch G, Zakrzewski G, and Sonneborn D: Prostatakrebs-Vorsorgeuntersuchung im Kreis Worbis. Organisation, Durchführung und erste Ergebnisse. Deutsch Gesundh 30: 1116, 1975.
3. Watanabe H, Kaiho H, Tanaka M, Terasawa Y: Diagnostic application of ultrasonotomography to the prostate. Invest Urol 8: 548, 1971.
4. Watanabe H, Igari D, Tanahashi Y, Harada K, Saitoh M: Development and application of new equipment for transrectal ultrasonotomography. J Clin Ultrasound 2: 91, 1974.
5. Watanabe H, Igari D, Tanahashi Y, Harada K, Saitoh M: Transrectal ultrasonotomography of the prostate. J Urol 114: 734. 1975.