Received: 9 May 2017
Accepted: 15 November 2017
First Online: 15 January 2018
: Ana Isabel López García, DPhil (Oxon), MPhil (Oxon), is an assistant professor at El Colegio de la Frontera Norte in Tijuana, Mexico.
: The author gives consent for publication in Comparative Migration Studies.
: The author declares that she has no competing interests in the manuscript.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.