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Ali I, Unruh H.Ali I, et al. Among authors: unruh h.Ann Thorac Surg. 1990 Sep;50(3):355-9. doi: 10.1016/0003-4975(90)90474-k.Ann Thorac Surg. 1990.PMID: 2400254
MacIntosh EL, Parrott JC, Unruh HW.MacIntosh EL, et al. Among authors: unruh hw.Ann Thorac Surg. 1991 Mar;51(3):515-9. doi: 10.1016/0003-4975(91)90888-w.Ann Thorac Surg. 1991.PMID: 1998444Review.