https://committees.parliament.uk/publications/7496/documents/78687/default/
https://www.thelancet.com/pdfs/journals/lancet/PIIS0140-6736(20)32290-X.pdf
https://envios.lavanguardia.com/optiext/optiextension.dll?ID=rZYrWdchS3m6DNJt6ye53iSRDlPTx3gSUlBVvrdfQOLVwKnHzvsIqpCxrrN3xsECxizID50x7bI8V2nt5eLz665Z4sh5B
http://neilcummins.com/tie_cog.pdf