6Ge X,Cavallazzi R,Li C,et al.Central venous access sites for the prevention of venous thrombosis,stenosis and infection[J].Cochrane Database Syst Rev, 2012,3 : C D00g08g.
4Marilyn E,Schallom,Donna Prentice,et al. Heparin or 0.9% sodi- um chloride to maintain central venous catheter patency:A random- ized trial[ J]. Crit Care Med ,2012,40(6 ) : 1820 - 1825.
