Research article

Who wants to join preventive trials? – Experience from the Estonian Postmenopausal Hormone Therapy Trial [ISRCTN35338757]

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Sirpa-Liisa Hovi^*, Matti Hakama^†, Piret Veerus^†, Mati Rahu^† and Elina Hemminki^†

BMC Medical Research Methodology 2005, 5:12 doi:10.1186/1471-2288-5-12

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