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Letter
Clarifications sought on retro-SCTL space
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Footnotes
Collaborators Nil.
Contributors RMS critically analyzed the published article, and drafted and revised the manuscript. VN drafted the manuscript. Both authors approved the final version of the manuscript.
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.