Data

on cancer in the subjects in our study were obtained from the National Cancer Statistics Clearing House, a compi-lation of data from all eight Australian population-based cancer registries, to which all cases of primary invasive cancer, except nonmelanoma skin cancer, are reported as required by statute ( 17). Data were available from 1982 to the end of 2001, 2002, or 2003, depending on the jurisdiction of cancer registration. Record linkage was performed using an established probabilistic technique, matching on each registrant ’ s name, sex, date of birth, date of death (if deceased), and state/territory o