4Marcus R J, Marcus D A, Sureshkumar K K, et al. Gender difi)rences in vascular access in hemodialysis patients in the United States: developing strategies for improving access out- come[J]. (;end Med, 2007,4(3) :193-204.
5Polkinghorne K R, McDonald S P, Atkins R C, et al. Vas- cular access and all-cause mortality: a propensity score anal- ysis[J]. J Am Soc Nephrol, 2004,15(2):477-486.