Name	Info	Provider	Link
	free resource	BioMed Central	https://trialsjournal.biomedcentral.com/articles/10.1186/s13063-019-3649-0
Surgery	free resource	MedlinePlus Health Information	https://medlineplus.gov/surgery.html
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/31675992/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/31675992
Full text from	free resource	White Rose Research Online	https://eprints.whiterose.ac.uk/153537/