1. Patient circuit components of anesthetic equipment between uses on different patients (Letter);Alfieri;Can J Infect Control,1995
2. CDC;Guidelines for preventing health-care-associated pneumonia, 2003 recommendations of the CDC and the Healthcare Infection Control Practices Advisory Committee,2004
3. Kommission für Krankenhaushygiene und Infektionspraevention am RKI;Praevention der nosokomialen Pneumonie,2000
4. Bacterial filters protect anaesthetic equipment in a low-flow system;Luttropp;Anaesthesia,1993
5. Prevent of patient bacterial contamination of anaesthesia-circle-systems;Rathgeber;a clinical study of the contamination risk and performance of different heat and moisture exchangers with electret filter (HMEF),1997