[\'Division of Clinical Epidemiology and Aging Research, German Cancer Research Center, 69120 Heidelberg, Germany.\', \'Network Aging Research, University of Heidelberg, 69120 Heidelberg, Germany.\']
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.