Name	Info	Provider	Link
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/25377533/
	subscription/membership/fee required	Springer	https://doi.org/10.1007/s10654-014-9966-4
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/25377533
	free resource	scite Smart Citations	https://scite.ai/reports/25377533
	free resource	Spiral, Imperial College Digital Repository	http://hdl.handle.net/10044/1/41200