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. 2014 Mar 10;16(3):e78. doi: 10.2196/jmir.3010

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©Paolo Bajardi, Alessandro Vespignani, Sebastian Funk, Ken TD Eames, W John Edmunds, Clément Turbelin, Marion Debin, Vittoria Colizza, Ronald Smallenburg, Carl E Koppeschaar, Ana O Franco, Vitor Faustino, Annasara Carnahan, Moa Rehn, Daniela Paolotti. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 10.03.2014.

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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Country-specific distribution of independent variables of enrolled participants: gender, age, education level, household composition, smoking, presence of a chronic condition, and vaccination status (SE = Sweden, UK = United Kingdom, NL = the Netherlands, BE = Belgium, FR = France, IT = Italy, PT = Portugal).