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Contributors MS, MCM-M, and CG performed the literature searches. All authors contributed to manuscript writing and approved the final version.
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 MS has received personal fees from AstraZeneca and personal fees from Merck Sharp and Dohme outside the submitted work. CG and MCM-M have nothing to disclose.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; internally peer reviewed.