Anderson RM, Heesterbeek H, Klinkenberg D, Hollingsworth TD (March 2020). "How will country-based mitigation measures influence the course of the COVID-19 epidemic?". The Lancet. 395 (10228): 931–934. doi : 10.1016/S0140-6736(20)30567-5 . PMID   32164834 . A key issue for epidemiologists is helping ...