© The Editor(s) (if applicable) and The Author(s) 2018 This book is an open access publication.Open  AccessThis  book  is  licensed  under  the  terms  of  the  Creative  Commons  Attribution  4.0  International License (http://creativecommons.org/licenses/by/4.0/), which permits use, sharing, adapta-tion, distribution and reproduction in any medium or format, as long as 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  images  or  other  third  party  material  in  this  book  are  included  in  the  book’s  Creative  Commons  license, unless indicated otherwise in a credit line to the material. If material is not included in the book’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.The use of general descriptive names, registered names, trademarks, service marks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use
Med mindre annet er angitt, så er denne innførselen lisensiert som © The Editor(s) (if applicable) and The Author(s) 2018 This book is an open access publication.Open AccessThis book is licensed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits use, sharing, adapta-tion, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this book are included in the book’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the book’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.The use of general descriptive names, registered names, trademarks, service marks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use