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Handling editor Josef S Smolen
Contributors All authors were involved in drafting the letter and revising it critically for intellectual content, and all authors approved the final version to be published. Study conception and design were done by LC-R and AAS. Acquisition of data was done by LC-R and AAS. RW, LC-R and AAS were involved in analysis and interpretation of data.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.
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