. 2017 Oct 6;23(6):1451–1458. doi: 10.1111/jep.12821
© 2017 The Authors Journal of Evaluation in Clinical Practice Published by John Wiley & Sons Ltd
This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.