Cambridge University Press would like to issue a retraction for the preliminary accepted manuscript publication of this article (Chan et al. Reference Chan, Ho and Yuen2020a). The article was simultaneously submitted and later published in BMJ Supportive & Palliative Care (Chan et al. Reference Chan, Ho and Yuen2020b), and Cambridge University Press did not have appropriate permission to publish the Accepted Manuscript version of this article.

The publisher apologizes to the author and to the editors of BMJ Supportive & Palliative Care for this error.