End of the millenium - end of the single thoracic artery graft. Two thoracic arteries - standard for the next millenium? Early clinical results and analysis of risk factors in 1487 patients with bilateral internal thoracic artery grafts. - Gansera,B.; Günzinger,R.; Angelis,I.; Eichinger,W.; Neumaier,P.; Breuer,M.; Kemkes,B.M. (Thorac Cardiovasc Surg, 2001)