Retrospective 60 ICU patients in Iran, showing that lower levels of vitamin D, magnesium, and zinc were significantly associated with higher APACHE scores (P = 0.001, 0.028, and <0.001, respectively) and higher lung involvement (P = 0.002, 0.045, and <0.001, respectively).
Beigmohammadi et al., 6/24/2021, retrospective, Iran, Middle East, peer-reviewed, 8 authors.