evidence: Serum 25(OH)D concentrations increased with vitamin D supplementation compared to placebo (p < 0.001).
intervention: vitamin D group receiving an initial bolus dose of 100,000 IU (in 2 capsules) followed by 4,000 IU (in 4 capsules) of cholecalciferol daily
comparator: the placebo group receiving an equivalent number of identical placebo capsules, which were continued daily for a period of 16 weeks
outcome: Serum 25(OH)D concentrations