CYP27A1 and atopic eczema: In a large cohort study of 1442 Chinese children with eczema and 1231 non-allergic controls, atopic eczema was associated with a vitamin D-related SNP rs4674343 on CYP27A1 (odds ratio 0.66, 95% confidence interval 0.53–0.83, p = 0.0004).