D2d Establishes a Participant Registry

A future long-term observational follow-up study (with no pills or visits) is being considered for the purpose of collecting simple health information to learn more about vitamin D and health (e.g., diabetes, cancer, heart disease). In anticipation of this possibility, the D2d coordinating center establishes a registry of D2d participants who wish to be contacted in the future and offered the opportunity to participate in this study.