Popis: |
Of 656 patients with ALL (all types) diagnosed in Switzerland during 4 consecutive 4-year periods (1976–1979, 1980–1983, 1984–1987, 1988–1991), 507 were officially registered on protocols (“study” patients) while 149 were not (“nonstudy” patients). The mean incidence of 3.8/100,000 children |