“…After further exclusion for non-Covid related, not relevant and only protocols, 59 publications were reviewed ( Supplementary Table S1). Twenty five (8 observational, 4 ecological, 1 interventional non-RCT, 4 Systematic review/meta-analysis/review and 8 editorial) new studies specifically explored the role of vitamin D deficiency in the progression of ARDS in COVID-19 infection (Arnold, 2020;Aygun, 2020;Brenner et al, 2020;Chakhtoura et al, 2020;D'Avolio et al, 2020;Ebadi and Montano-Loza, 2020;Faul et al, 2020;Haj Bloukh et al, 2020;Hastie et al, 2020;Ilie et al, 2020;Laird et al, 2020;Martineau and Forouhi, 2020;Meltzer et al, 2020;Ohaegbulam et al, 2020;Panagiotou et al, 2020;Quesada-Gomez et al, 2020; Raisi-Estabragh et al, 2020; Silberstein, 2020; Singh et al, 2020;Slominski et al, 2020;Sun et al, 2020;Townsend et al, 2020;Tramontana et al, 2020;Whittemore, 2020) (Tables 2, 3). Figure 2 presents a PRISMA diagram of the review search B.…”