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Competing interests Dr Furqaan Ahmed has none to declare. Professor Foster has received funding from companies that manufacture drugs used to treat viral hepatitis. Specifically he has received consultancy fees from Roche, Novartis, Chughai, Tibotec, Gilead and BMS and he has received grant funding from Roche, Chughai and Gilead.
Provenance and peer review Commissioned; not externally peer reviewed.