A useless raffle.
نویسندگان
چکیده
A mailed questionnaire was sent to 2712 subjects asking about respiratory symptoms, and a raffle for three prizes of 50 pounds, 30 pounds, and 20 pounds was organised. The response rate in the 1762 who were told about the raffle was no higher than for 950 subjects who served as controls.
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عنوان ژورنال:
- Journal of epidemiology and community health
دوره 39 2 شماره
صفحات -
تاریخ انتشار 1985