Ambreen Chaudhry, Amna Ali, Aashifa Yaqoob, Ahmed Wali, Razia Fatima, and Aamer Ikram. “Contribution and Effectiveness of Event-Based Surveillance System in Disease Detection and Containment in Pakistan for Year 2017”. Pakistan Journal of Medical Research, vol. 58, no. 4, Feb. 2020, pp. 176-9, https://www.pjmr.org.pk/index.php/pjmr/article/view/24.