9Torres A, Febregas N, Ewig S, et al. Sampling methods for Ventilation-associated pneumonia : Validation using different histologic and microbiological references. Crit Care M. ed,2000,28(8) :2799-2804.
10King M, Zahm JH, Pierrot D. The role of mucus gel viscosity, spinnability,and adhesive Properties in clearance by simulated cough. Biorheology,1998,26:737-745.