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

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

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

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