2[1]Sackeet DL,Rosenberg WMC,Gray JAM,et al.Evidence based medicine:what it is and what it isn't[J].BMJ,1996,(2):71-72.
3[2]Sackett DL,Straus SE,Richardson S,etal.Evidence-Based Medicine:how to practice and teach evidence-based medicine[M].New York:Churchill Livingstone,2000.1-10.