4Yurtseven N, Aydemir B, Karaca P, et al. Percu twist: a new al- ternative to griggs and eiaglia's techniques[J]. Eur J Anaesthe- siol,2007,24(6) :492--497.
5Beltrame F,Zussino M, Martinez B, et al. Percutaneous versus surgical bedside tracheostomy in the intensive care unit., a co- hort study[J]. Minerva Anestesiol, 2008,74 (10) : 529-- 535.