Background: To revisit the association between vitamin D deficiency (VDD. defined as serum 25(OH)D < 20 ng/ml) and incident active tuberculosis (TB). after two potentially underpowered randomized trials showed statistically non-significant 13%–22% decrease in TB incidence in vitamin D supplementation groups. Methods: We prospectively conducted an age/sex-matched case–control study tha... https://smokeaers.shop/product-category/dab-rigs/