No increase in response rate by adding a web response option to a postal population survey: A randomized trial

Brøgger, Jan; Nystad, Wenche; Cappelen, Inger; Bakke, Per
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http://hdl.handle.net/11250/2507831
Date
2008
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Journal of Medical Internet Research 2008, 9(5):e40   10.2196/jmir.9.5.e40
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