https://www.medrxiv.org/content/medrxiv/early/2020/05/06/2020.05.01.20087064.full.pdf
https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3780841
https://dspace.mit.edu/bitstream/handle/1721.1/129615/e2014564118.full.pdf
https://www.pnas.org/doi/10.1073/pnas.2015954117
