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Contributors TRE, RO and SZYO contributed to the design of the work, and the acquisition, analysis and interpretation of data. TRE was involved in drafting the work. RO was involved in revising it critically for important intellectual content. TRE, RO and SZYO have provided final approval for the letter to be published. TRE, RO and SZYO agreed to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.
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.
Provenance and peer review Not commissioned; internally peer reviewed.