TY  - RPRT
TI  - [Bronchodilation in COPD. How can we increase efficiency?].
AU  - J M Marín
AU  - A Sánchez
PY  - 2004
DO  - 10.1157/13077786
UR  - https://pubmed.ncbi.nlm.nih.gov/16137447/
ID  - 16137447
ER  -