. 2018 Oct 23;20(10):e11006. doi: 10.2196/11006
©Roberto Collado-Borrell, Vicente Escudero-Vilaplana, Antonio Calles, Estela Garcia-Martin, Belen Marzal-Alfaro, Eva Gonzalez-Haba, Ana Herranz-Alonso, Maria Sanjurjo-Saez. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 23.10.2018.
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