TY  - RPRT
TI  - Simple interventions--significant impact.
AU  - Michael C Hartlieb
AU  - William J Sibbald
PY  - 2002
DO  - 10.1164/ajrccm.165.4.2112073b
UR  - https://pubmed.ncbi.nlm.nih.gov/11850331/
ID  - 11850331
ER  -