1. Wikipedia, “List of Natural Disasters by Death Toll,” https://en.wikipedia.org/wiki/List_of_natural_disasters_by_death_toll [accessed October 20, 2020]
2. Wikipedia, “World War II Casualties,” https://en.wikipedia.org/wiki/World_War_II_casualties [accessed October 20, 2020]
3. J. Tortorice, “The Deadliest Pandemics in History,” 2020, https://ceufast.com/blog/the-deadliest-pandemics-in-history [accessed October 30, 2020]
4. N. Zhu et al., “A Novel Coronavirus from Patients with Pneumonia in China, 2019,” N. Engl. J. Med., Vol.382, No.8, pp. 727-733, 2020.
5. C. Huang et al., “Clinical features of patients infected with 2019 novel coronavirus in Wuhan, China,” The Lancet, Vol.395, Issue 10223, pp. 497-506, 2020.