. 2021 Jul 14;7(4):e131. doi: 10.1192/bjo.2021.968
© The Author(s) 2021
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.