- Prior other diseases: patients with prior disorders potentially affecting vitamin D levels and metabolism of calcium and phosphate will be excluded. Pregnant or lactating women are ineligible for this study. We plan to exclude patients with any known disorders of the endocrine system affecting vitamin D metabolism, including: hyperparathyroidism, known history of nephrolithiasis, any documented malignancies, and advanced renal disease. Patients with prior disorders that may potentially affect cathelicidin levels will be excluded as well. These diseases include atopic dermatitis (eczema) and hematologic malignancies (leukemia, lymphoma, among others)