1. Asper R (1984) Epidemiology and socioeconomic aspects of urolithiasis. Urol Res 12: 1–5
2. Inada T (1955) Statistical study of urolithiasis in Japan (in Japanese). Hinyokika Kiyo 1: 143–152
3. Inada T (1966) Research on urolithiasis (in Japanese). Nihon Hinyokika Gakkai Zasshi 57: 917–929
4. Yoshida O (1979) Epidemiology of urolithiasis in Japan (in Japanese). Nihon Hinvokika Gakkai Zasshi 70: 975–983
5. Yoshida O. Okada Y (1990) Epidemiology of urolithiasis in Japan: a chronological and geographical study. Urol Int 45: 104–111