Edinb Med JedinbmedjEdinburgh Medical Journal0367-1038Oliver and BoydEdinburgh296397795320361edinbmedj74772-0052PeriscopeNew Views on the Thyroid12192633New Ser 212733737http://creativecommons.org/licenses/by/4.0/This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License, which permits non-commercial use and redistribution provided that the original author and source are credited.