COVID-19 and the scaled-down 2020 Hajj Pilgrimage—Decisive, logical and prudent decision making by Saudi authorities overcomes pre-Hajj public health concerns. (October 2020) - Zumla, Alimuddin; Azhar, Esam I.; Alqahtani, Saleh; Shafi, Shuja; Memish, Ziad A.