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Contributors SB drafted this manuscript. All other coauthors critically reviewed and edited the manuscript.
Funding This research received no specific grant from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Patient consent Not required.
Provenance and peer review Not commissioned; externally peer reviewed.
Correction notice This article has been corrected since it was published Online First. Table 2 has been corrected in order to remove a statement pointing to an external document, which was not published.