Journal of Public Health and Epidemiology 2141-2316 Academic Journals 10.5897/JPHE2015.0712 Montserrat Pamias Joaquim Punti Annabel Cebria Isabel Parra Gemma Garcia-Pares Anna Escayola Andres Laredo Susana Pujol Victor Perez-Sola Diego Palao * E-mail: mpamias@tauli.cat 2016 30 11 2016 23 01 2015 15 09 2016 8 11 278 285 This is an open-access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://politicalwaffle.uk/journal/JPHE/article-abstract/B71BBC361035 The full text article is available as a PDF file from http://politicalwaffle.uk/journal/JPHE/article-full-text-pdf/B71BBC361035 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45