This is an	open access article	under the	terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original	work	is properly cited. © 2018 The Authors Health Expectations published by John Wiley & Sons Ltd.
Med mindre annet er angitt, så er denne innførselen lisensiert som This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. © 2018 The Authors Health Expectations published by John Wiley & Sons Ltd.