Baseline characteristics of cases and controls in NHS, HPFS and PHS.
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N/A: not available. Within each cohort, 3 controls were randomly selected from participants alive and free of cancer at the time of case ascertainment, and matched to cases based on ethnicity, year of birth and month/year of blood or buccal sampling (NHS and HPFS) [30] and in PHS, controls were additionally matched on smoking status [32].
创建时间：
2014-03-26
