Letter by Choi and Kwak Regarding Article, "Serum Bioavailable and Free 25-Hydroxyvitamin D Levels, but Not Its Total Level, Are Associated With the Risk of Mortality in Patients With Coronary Artery Disease"
Circ Res. 2019 Oct 25;125(10):e71-e72.
doi: 10.1161/CIRCRESAHA.119.315631.
Epub 2019 Oct 24.