TY  - RPRT
TI  - [COPD: stage-appropriate therapy].
AU  - H Wilkens
AU  - G W Sybrecht
PY  - 2001
DO  - 10.1007/s001080170017
UR  - https://pubmed.ncbi.nlm.nih.gov/11793604/
ID  - 11793604
ER  -