Footnotes

• Contributors RA is responsible for our PDPH treatment group of study. RA and HC developed the idea of writing a letter to the editor concerning Cohen et al’s article. SP and JX wrote the draft manuscript. RA, HC, CC and HM contributed with comments and review on the original article. All authors provided critical feedback, discussed the original article and issues to address on the letter and helped revise the final 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.

• Patient consent for publication Not required.

• Provenance and peer review Not commissioned; internally peer reviewed.