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Martin MM, Lemmer JH Jr, Shaffer E, Dick M 2nd, Bove EL.Martin MM, et al. Among authors: shaffer e.Ann Thorac Surg. 1988 Jan;45(1):16-20. doi: 10.1016/s0003-4975(10)62386-7.Ann Thorac Surg. 1988.PMID: 3337571
Hernandez RJ, Bank ER, Shaffer EM, Snider AR, Rosenthal A.Hernandez RJ, et al. Among authors: shaffer em.AJR Am J Roentgenol. 1987 Jun;148(6):1189-94. doi: 10.2214/ajr.148.6.1189.AJR Am J Roentgenol. 1987.PMID: 3554935