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. 2008 Jun 30;10(2):e18. doi: 10.2196/jmir.992

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© Cornelia F van Uden-Kraan, Constance HC Drossaert, Erik Taal, Erwin R Seydel, Mart AFJ van de Laar. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 30.06.2008. Except where otherwise noted, articles published in the Journal of Medical Internet Research are distributed under the terms of the Creative Commons Attribution License (http://www.creativecommons.org/licenses/by/2.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 1) the original work is properly cited, including full bibliographic details and the original article URL on www.jmir.org, and 2) this statement is included.

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