**Author details**

Amelia J. Hessheimer and Constantino Fondevila\* General and Digestive Surgery, Digestive and Metabolic Disease Institute (ICMDM), Hospital Clínic, CIBERehd, IDIBAPS, University of Barcelona, Spain

\*Address all correspondence to: cfonde@clinic.cat

© 2019 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
