Blar i Norwegian Institute of Public Health Open Repository på emneord "Electronic Mail"
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International questionnaire postal response rate: an experiment comparing no return postage to provision of International Postage Vouchers--"Coupon-Réponse International".
(Journal article; Peer reviewed, 2004-07-06)BACKGROUND: Previous studies of methods to increase response rates on international postal surveys did not include providing return postage. We provided International Postage Vouchers--"Coupon-Réponse International" to ...