Lower plasma calcium associated with COVID-19, but not with disease severity: a two-centre retrospective cohort study. - Deodatus, Jan Arne; Kooistra, Simone Anna; Kurstjens, Steef; Mossink, Joram Cornèl Leon; van Dijk, Joris David; Groeneveld, Paul Hendrik Pieter; van der Kolk, Brigitta Yarine Maxime (Infectious Diseases, 2022)