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Contributors The letter was conceived, coauthored and reviewed by all of the authors.
Funding AJS is funded by a Wellcome Trust Clinical PhD Fellowship (grant 109130/Z/15/Z); World Health Organisation (WHO), Geneva, Switzerland.
Competing interests The authors are presently working on estimates of global hepatitis D prevalence in collaboration with WHO.
Provenance and peer review Not commissioned; externally peer reviewed.
Patient consent for publication Not required.
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