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Contributors Both K-SC and WKL contributed to this response to the letter to the editor.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests WKL has received honorarium for attending advisory board meetings of Takeda and Abbott Laboratories. There are no competing interests for the other author.
Patient consent Obtained.
Ethics approval HKU IRB.
Provenance and peer review Not commissioned; internally peer reviewed.
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