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Beckmann A, Dittrich S, Arenz C, Krogmann ON, Horke A, Tengler A, Meyer R, Bauer UMM, Hofbeck M; German Quality Assurance / Competence Network for Congenital Heart Defects Investigators.Beckmann A, et al.Thorac Cardiovasc Surg. 2021 Dec;69(S 03):e21-e31. doi: 10.1055/s-0041-1722978. Epub 2021 Feb 26.Thorac Cardiovasc Surg. 2021.PMID: 33638137Free PMC article.