3.4.1 Study Medication (Vitamin D/Placebo): Patients will be blocked randomized into one of four groups using a balanced assignment. The target number of patients is 20, with five patients who have successfully completed all assessments in each group. Groups will be closed to enrollment once their target is reached. The recruitment will continue until every group has reached its target. The investigative pharmacy will prepare each dosage according to the randomization and will hold the key to the dosing.