Müller, Ivan, Stefanie Gall, Lindsey Beyleveld, Markus Gerber, Uwe Pühse, Rosa du Randt, Peter Steinmann, Leyli Zondie, Cheryl Walter, and Jürg Utzinger. “Shrinking Risk Profiles After Deworming of Children in Port Elizabeth, South Africa, With Special Reference to Ascaris Lumbricoides and Trichuris Trichiura”. Geospatial Health 12, no. 2 (November 27, 2017). Accessed July 13, 2020. https://geospatialhealth.net/index.php/gh/article/view/601.