. 2010 Sep 30;12(3):e44. doi: 10.2196/jmir.1402
©Suzan JW Robroek, Wendy Brouwer, Dennis Lindeboom, Anke Oenema, Alex Burdorf. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 30.09.2010
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Figure 2.
Study design with the two distinct periods for website use