At the conclusion of the study, those in the treatment group whose serum 25 OH D levels have reached > 30ng/mL (therapeutic) may continue on maintenance doses on ergocalciferol (1,000 Units/day) if they are receiving clinical benefit. For those whose 25 OH D levels are < 30ng/mL, regardless of whether they received clinical benefit or not from the treatment arm, they will be offered a repeated 8 week course of Ergocalciferol therapy at 50,000 Units/week under standard of care. It will be up to the patient to accept or decline the therapy.