@article{202104.0633,
	doi = {10.20944/preprints202104.0633.v1},
	url = {https://doi.org/10.20944/preprints202104.0633.v1},
	year = 2021,
	month = {April},
	publisher = {Preprints},
	author = {Tom Jefferson and Carl Heneghan and Elizabeth Spencer and Jon Brassey and Annete Pluddeman and Igho Onakpoya and David Evans and John Conly},
	title = {A Hierarchical Framework for Assessing Transmission Causality of Respiratory Viruses<strong> </strong>},
	journal = {Preprints}
}