A study on the possible merits of using symptomatic cases to trace the development of the COVID-19 pandemicGianluca Bonifazi, Luca Lista, Dario Menasce, Mauro Mezzetto, Daniele Pedrini, Roberto Spighi and Antonio ZoccoliEur. Phys. J. Plus, 136 5 (2021) 481DOI: https://doi.org/10.1140/epjp/s13360-021-01448-2