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. 2018 Oct 24;11:25. doi: 10.1186/s40545-018-0153-y

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© The Author(s). 2018

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Mexico – the five regions of study. Region 1 (North): Baja California, Baja California Sur, Chihuahua, Coahuila, Durango, Nuevo León, Sinaloa, Sonora, Tamaulipas. Region 2 (Center): Mexico City, Mexico State, Guanajuato, Morelos, Querétaro, San Luis Potosí, Zacatecas. Region 3 (West): Aguascalientes, Colima, Guerrero, Jalisco, Michoacan, Nayarit. Region 4 (East): Hidalgo, Puebla, Tlaxcala, Veracruz. Region 5 (South): Campeche, Chiapas, Oaxaca, Quintana Roo, Tabasco, Yucatan.