van der Velde Robert Y., Brouwers Jacobus R. B. J., Geusens Piet P., Lems Willem F., and van den Bergh Joop P. W. “Calcium and Vitamin D Supplementation: State of the Art for Daily Practice”. Food & Nutrition Research00 (August 7, 2014). Accessed November 26, 2024. https://foodandnutritionresearch.net/index.php/fnr/article/view/650.