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We read with great interest the article by Goyal et al.1 We would like to draw your attention to four recently published papers that deal with the important aspect mentioned in their article—“[…] The discussion about where the M1 stops and where the M2 starts is therefore an artificial one, necessitating a more ‘practical’ approach for everyday work […]”.
This ‘more practical’ approach exists. It was described …
Competing interests None declared.
Provenance and peer review Not commissioned; internally peer reviewed.