Footnotes

• Contributors NR initiated the project, formed the clinical question and completed the literature search. Both NR and TJvH independently reviewed the titles, abstracts and full-text articles. NR wrote the manuscript. TJvH proof-read a few drafts and with further input strengthened the quality of the article. PRAM connects paediatric trainees with research interests across the West Midlands Region to allow for collaboration in projects, including evidence reviews.

• 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.

• Supplemental material This content has been supplied by the author(s). It has not been vetted by BMJ Publishing Group Limited (BMJ) and may not have been peer-reviewed. Any opinions or recommendations discussed are solely those of the author(s) and are not endorsed by BMJ. BMJ disclaims all liability and responsibility arising from any reliance placed on the content. Where the content includes any translated material, BMJ does not warrant the accuracy and reliability of the translations (including but not limited to local regulations, clinical guidelines, terminology, drug names and drug dosages), and is not responsible for any error and/or omissions arising from translation and adaptation or otherwise.