Lead Sponsor: Johns Hopkins University

Collaborators: University of Pennsylvania, University of Rochester, University of California, San Francisco, Yale University, Stanford University, Columbia University, The Cleveland Clinic, Swedish Medical Center, Oregon Health and Science University, University of Virginia, Washington University School of Medicine, Icahn School of Medicine at Mount Sinai, Anne Arundel Health System Research Institute, University of Massachusetts, Worcester, Dignity Health

Intervention / Treatment: DRUG: Vitamin D3