. 2017 Oct 27;91(1090):20170441. doi: 10.1259/bjr.20170441
© 2017 The Authors. Published by the British Institute of Radiology
This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 Unported License http://creativecommons.org/licenses/by-nc/4.0/, which permits unrestricted non-commercial reuse, provided the original author and source are credited.