7Teo DT,Lim TW. Transmission of tuberculosis from patient to healthcare workers in the anaesthesia context [J]. Ann Acad Med Singapore, 2004,33 (1) : 95.
8Vezina DP, Trepanier CA, Lessard MR, et al. Anesthesia breathing circuits protected by the DAR Barrierbae S breathin filter have a low bacterial contamination rate[J]. Can Anaesth J,2001,48(8) :748-754.