Pal et al., Frontiers in Medicine,
doi:10.3389/fmed.2020.590805 (Peer Reviewed)
High Prevalence of Hypocalcemia in Non-severe COVID-19 Patients: A Retrospective Case-Control Study
Retrospective 72 non-severe COVID-19 patients in India, showing very high levels of vitamin D deficiency (70 of 72 patients).
Pal et al., 1/7/2021, peer-reviewed, 11 authors.