Verkaik-Kloosterman, Janneke, Marja Beukers, Elly Buurma-Rethans, Hans Verhagen, and Marga Ocké. “Evaluation of the Dutch General Exemption Level for Voluntary Fortification With Folic Acid”. Food & Nutrition Research00 (April 2, 2012). Accessed October 19, 2019. https://foodandnutritionresearch.net/index.php/fnr/article/view/513.