HPLC: High-Performance Liquid Chromatography; RIA: Radioimmunoassay; ELISA: Enzyme-Linked Immunosorbent Assay; T1D: Type 1 Diabetes; VDR: Vitamin D Receptors; LC-MS/MS: Liquid Chromatography-Tandem Mass Spectrometry; EIA: Enzyme Immunoassay; ELFA: Enzyme-Linked Fluorescent Assay; ECLIA: Electrochemiluminescence Immunoassay; NR: Not Reported; HB1AC: Hemoglobin A1C; n: Number of subjects. This evidence concerns the gene VDR and type 1 diabetes mellitus.