A hospital-based unmatched case-control study design was used. A case-control design has many benefits, including that less time is required to conduct the study than is needed for a cohort study;...
The best source of vitamin D is exposure to natural sunlight and 90% of vitamin D is derived from sunlight with 10% derived from food and plant sources (Paxton et al, 2013; Cannell, 2019)...
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