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. 2013 Aug 26;15(8):e173. doi: 10.2196/jmir.2595

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©Lena Hohwü, Heidi Lyshol, Mika Gissler, Stefan Hrafn Jonsson, Max Petzold, Carsten Obel. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 26.08.2013.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in the Journal of Medical Internet Research, is properly cited. The complete bibliographic information, a link to the original publication on http://www.jmir.org/, as well as this copyright and license information must be included.

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Percentage of received questionnaires by days for the paper (paper-based questionnaire only), paper/Web (paper- and/or Web-based questionnaire), Web (Web-based questionnaire only), and Web/tablet (Web-based questionnaire with tablet computer incentive within 14 days of invitation) modes in the Danish 2011 NordChild questionnaire survey.