[1] HARVARD UNIV, SCH PUBL HLTH, DEPT EPIDEMIOL, BOSTON, MA 02115 USA
[2] UNIV MANCHESTER, DEPT COMMUNITY MED, MANCHESTER M13 9PL, LANCS, ENGLAND
[3] UNIV MANCHESTER, DEPT ONCOL, MANCHESTER M13 9PL, LANCS, ENGLAND
[4] UNIV HOSP S MANCHESTER, DEPT EPIDEMIOL & SOCIAL RES, MANCHESTER M20 8LR, LANCS, ENGLAND
[5] NAGOYA UNIV, SCH MED, DEPT PREVENT MED, NAGOYA, AICHI 466, JAPAN
[6] FIRST RED CROSS HOSP, DEPT UROL, NAGOYA, JAPAN