[\'Department of Internal Medicine V, University of Heidelberg, 69120 Heidelberg, Germany.\', \'Department of Internal Medicine IV, University of Heidelberg, 69120 Heidelberg, Germany.\']
Reply to: \'Vitamin D Insufficiency May Account for Almost Nine of Ten COVID-19 Deaths: Time to Act. Comment on: Vitamin D Deficiency and Outcome of COVID-19 Patients. Nutrients 2020, 12, 2757\'.