TY  - RPRT
TI  - Blowing soap bubbles: teaching pursed-lip breathing.
AU  - L M Custodio
PY  - 1998
DO  - 10.1378/chest.114.4.1224
UR  - https://pubmed.ncbi.nlm.nih.gov/9792603/
ID  - 9792603
ER  -