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Footnotes
Contributors CAW, AH, RW, REGS and W-LvdP were involved in the study concept and design. CAW, AH, RIW, IC, MS, KMJH-P, EJNG, REGS and W-LvdP were involved in acquisition, analysis and interpretation of data. CAW, AH, EJNG and W-LvdP were involved in drafting a significant portion of the manuscript and figures. All authors were involved in revising the manuscript for intellectual content and have approved its final version.
Funding Our work was financially supported by the Prinses Beatrix Spierfonds (WAR 14-26) and stichting Spieren voor Spieren.
Competing interests The competing interests statement reads 'nothing to report'. This option was chosen as none of the conflicts are relevant financial activities/relevant interests to the submitted work. Full details are provided in the ICMJE forms that were uploaded to the journal.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; externally peer reviewed.