Journal Article
Wirth, James P, Nicolai Petry, Sherry A Tanumihardjo, Lisa M Rogers, Erin McLean, Alison Greig, Greg S Garrett, Rolf DW Klemm, and Fabian Rohner.
"Vitamin A supplementation programs and country-level evidence of vitamin A deficiency." Nutrients 9, no. 3 (2017).