Mobile phone data and COVID-19: Missing an opportunity? - Nuria Oliver; Emmanuel Letouzé; Harald Sterly; Sébastien Delataille; Marco De Nadai; Bruno Lepri; Renaud Lambiotte; Richard Benjamins; Ciro Cattuto; Vittoria Colizza; Nicolas de Cordes; Samuel P. Fraiberger; et al. (CoRR, 2020)