Cited 4 times since 2002 (0.2 per year) source: EuropePMC The Journal of thoracic and cardiovascular surgery, Volume 123, Issue 2, 1 1 2002, Pages 348-349 Quadricuspid aortic valve in transposition of the great arteries. Portela FA, Hazekamp MG, Bartelings MM, Gittenberger-De Groot AC