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Ris HB, Banic A, Furrer M, Caversaccio M, Cerny A, Zbären P.Ris HB, et al.Ann Thorac Surg. 1996 Dec;62(6):1650-4. doi: 10.1016/s0003-4975(96)00683-2.Ann Thorac Surg. 1996.PMID: 8957367
Striffeler H, Gugger M, Im Hof V, Cerny A, Furrer M, Ris HB.Striffeler H, et al. Among authors: ris hb.Ann Thorac Surg. 1998 Feb;65(2):319-23. doi: 10.1016/s0003-4975(97)01188-0.Ann Thorac Surg. 1998.PMID: 9485221