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Heavner JE, Calvillo O, Racz GB.Heavner JE, et al. Among authors: racz gb.Reg Anesth. 1997 May-Jun;22(3):257-9. doi: 10.1016/s1098-7339(06)80011-8.Reg Anesth. 1997.PMID: 9168218
Viesca CO, Racz GB, Day MR.Viesca CO, et al.Anesthesiol Clin North Am. 2003 Dec;21(4):745-66, vi. doi: 10.1016/s0889-8537(03)00088-9.Anesthesiol Clin North Am. 2003.PMID: 14719717Review.