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The authors determined whether compliance would improve if a letter of invitation contained a definite appointment for breast cancer screening rather than an open ended request to make an appointment. A sample of 450 women aged 45-64 was identified from the age-sex registers of two general practitioners from one practice in Aylesbury and randomly allocated to receive either a letter with an appointment (group 1) or an open ended letter of invitation (group 2) for breast cancer screening
Williams et al. (Sat,) studied this question.