Case study: the lower the Vitamin D level, the higher the COVID-19-the risk of death A case study of Indonesian researchers at the clinics RSUD Kabupaten Sukamara, Kec ends. Sukamara, Kabupaten Sukamara, as well as Kalimantan Tengah, analysed the data, and gradients of a total of 780 COVID-19-Patients had to…