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Contributors JED, RGN and SY conceptualised the literature review. JED and RGN conducted the search, the data extraction and data synthesis. JED, RGN and SY wrote the letter.
Funding This project has received funding from the European Union’s Horizon 2020 research and innovation programme under Grant Agreement No. 668303.
Competing interests None declared.
Provenance and peer review Not commissioned; internally peer reviewed.
Patient consent for publication Not required.