[1] UNIV MILAN,OSPED S GIUSEPPE,DIV CHIRURG,CATTEDRA CHIRURG GEN,I-20123 MILAN,ITALY
[2] CLEVELAND CLIN FDN,DEPT THORAC & CARDIOVASC SURG,CLEVELAND,OH 44195
[3] UNIV PITTSBURGH,THORAC SURG SECT,PITTSBURGH,PA 15213
[4] MASSACHUSETTS GEN HOSP,DEPT THORAC SURG,GEN THORAC SURG UNIT,BOSTON,MA 02114