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Contributors I am the sole author of this work.
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 None declared.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; internally peer reviewed.
↵Cf. OHRP, idem: 'IRBs should be cautious that payments are not so high that they create an ‘undue influence’ or offer undue inducement that could compromise a prospective subject’s examination and evaluation of the risks or affect the voluntariness of his or her choices.'