Access to data is controlled by the NHLBI Data Access Committee (DAC), which uses the database of Genotypes and Phenotypes (dbGaP) permissions infrastructure. To access controlled-access data in BDC, an investigator must have an approved Data Access Request (DAR) in dbGaP. The role of the NHLBI DAC is to review and approve (or deny) investigator-submitted DARs and to ensure investigator compliance with the NIH Genomic Data Sharing Policy.