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. 2016 Feb 5;18(2):e30. doi: 10.2196/jmir.5198

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©Cyril FM Marsaux, Carlos Celis-Morales, Katherine M Livingstone, Rosalind Fallaize, Silvia Kolossa, Jacqueline Hallmann, Rodrigo San-Cristobal, Santiago Navas-Carretero, Clare B O'Donovan, Clara Woolhead, Hannah Forster, George Moschonis, Christina-Paulina Lambrinou, Agnieszka Surwillo, Magdalena Godlewska, Jettie Hoonhout, Annelies Goris, Anna L Macready, Marianne C Walsh, Eileen R Gibney, Lorraine Brennan, Yannis Manios, Iwona Traczyk, Christian A Drevon, Julie A Lovegrove, J Alfredo Martinez, Hannelore Daniel, Michael J Gibney, John C Mathers, Wim HM Saris. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 05.02.2016.

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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Flowchart of study procedures. Participants in Level 0 (controls) received standard, nonpersonalized guidelines during the intervention, whereas participants in Levels 1-3 received personalized advice. PA: physical activity; FTO: fat mass- and obesity-associated gene.