APOB and Huntington disease: Contrary to our findings of significantly higher ApoB concentrations and ApoB/ApoAI ratio in the analysed HD patients with ≥ 50 nmol/L 25(OH)D concentrations compared to 25(OH)D < 50 nmol/L HD patients, some previous studies have presented positive effect of vitamin D supplementation on the lipid parameters of regular hemodialysis patients [28], [29], [30].