letter . 2021 May 25;194(3):553–556. doi: 10.1111/bjh.17530
© 2021 British Society for Haematology and John Wiley & Sons Ltd
This article is being made freely available through PubMed Central as part of the COVID-19 public health emergency response. It can be used for unrestricted research re-use and analysis in any form or by any means with acknowledgement of the original source, for the duration of the public health emergency.