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Bernhard A, Mahmoodi M, Sievers HH, Kraatz EG, Maurer I, Heintzen P.Bernhard A, et al. Among authors: sievers hh.Thorac Cardiovasc Surg. 1989 Oct;37(5):313-5. doi: 10.1055/s-2007-1020340.Thorac Cardiovasc Surg. 1989.PMID: 2588250
Bernhard A, Yacoub M, Regensburger D, Sievers HH, Smith RR, Stephan E, Lange PE, Keck EW, Heintzen PH.Bernhard A, et al. Among authors: sievers hh.Thorac Cardiovasc Surg. 1981 Jun;29(3):138-42. doi: 10.1055/s-2007-1023463.Thorac Cardiovasc Surg. 1981.PMID: 6167010