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Footnotes
Handling editor Iskander Chaudhry.
Contributors Conception and design of study: JMAB, JGvdH, BMvdK, LAB. Acquisition of patient data and literature: JMAB, EEAA, LAB. Analysis and/or interpretation of data and literature: JMAB, EEAA, LAB. Drafting the manuscript: JMAB, LAB. Revising the manuscript critically for important intellectual content: JMAB, JGvdH, EEAA, BMvdK, LAB. Approval of the version of the manuscript to be published: JMAB, JGvdH, EEAA, BMvdK, LAB. All authors certify that they have participated sufficiently in the work to take public responsibility for the content, including participation in the concept, design, analysis, writing or revision of the manuscript.
Competing interests None declared.
Patient consent Not required.
Provenance and peer review Not commissioned; internally peer reviewed.