Reconstructing the early global dynamics of under-ascertained COVID-19 cases and infections oleh Timothy W. Russell, Nick Golding, Joel Hellewell, Sam Abbott, Lawrence Wright, Carl A. B. Pearson, Kevin van Zandvoort, Christopher I. Jarvis, Hamish Gibbs, Yang Liu, Rosalind M. Eggo, W. John Edmunds, Adam J. Kucharski, on behalf of the CMMID COVID-19 working group