TY - GEN AU - Hess,D R TI - The evidence for secretion clearance techniques SN - 0020-1324 PY - 2002///0716 KW - Drainage KW - methods KW - Evidence-Based Medicine KW - Humans KW - Lung Diseases KW - therapy KW - Mucus KW - Respiration KW - Respiration, Artificial N1 - Publication Type: Journal Article; Review ER -