Letter to the Editor: Vitamin D deficiency in COVID-19: Mixing up cause and consequence

Smolders, J., van den Ouweland, J., Geven, C., Pickkers, P., & Kox, M. (2021, February 1). Letter to the Editor: Vitamin D deficiency in COVID-19: Mixing up cause and consequence. Metabolism: Clinical and Experimental. W.B. Saunders. https://doi.org/10.1016/j.metabol.2020.154434