TY - RPRT TI - Closed tracheal suction systems: effectiveness and nursing implications. AU - M L Noll AU - C D Hix AU - G Scott PY - 1990 DO - 10.4037/15597768-1990-2010 UR - https://pubmed.ncbi.nlm.nih.gov/2206731/ ID - 2206731 ER -