Brazilian clinical trial registry identifier Brazilian Registry of Clinical Trials identifier http://www.ensaiosclinicos.gov.br/ ReBEC identifier A centrally registered identifier that is assigned for a specific clinical trial registered in Brazilian Registry of Clinical Trials (ReBEC). The format for the ReBEC registry number is “RBR-” followed by 6 characters, e.g., RBR-4hb9qs. Clinical Trial Registry Identifier