Compliance statements:
- We, the authors, Disclosure no conflict of interests. This includes:
relevant financial, personal, political, intellectual or religious
interests.
- All authors contributed equally to the final manuscript. TS, JL, and
DWT performed the data analysis. DWT, DT-J and JL formulated the study
concept. All authors (TS, JL, DT-J and DWT agreed the final manuscript
prior to submission.
- Ethics approval was not required since the study was a retrospective
analysis of data already collected and used for the purposes of the UK
National Antenatal Haemoglobinopathy screening programme. No
additional blood samples were required for the study.
- The study was not funded.
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