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Contributors MM is the sole author.
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.
Provenance and peer review Not commissioned; internally peer reviewed.
Author note References 3, 4 and 5 can be found as abridged versions at https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD005328.pub3/detailed-comment/en?messageId=173593468 (abridged comment), https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD005328.pub3/detailed-comment/en?messageId=192922758 (abridged comment) and https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD005328.pub3/detailed-comment/en?messageId=197353704 (abridged comment), respectively.