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British Doctors Study
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==The study== In October 1951, the researchers wrote to all registered physicians in the United Kingdom, and obtained responses in two-thirds, 40,701 of them. No further cohorts were recruited. Because of the limited sample size females were excluded from most analyses and publications focused on the male physicians. The respondents were stratified into decade of birth, sex and their cause-specific mortality, as well as general physical health and current smoking habits, followed up in further questionnaires in 1957, 1966, 1971, 1978, 1991 and finally in 2001.
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