TY  - RPRT
TI  - Percutaneous tracheostomy insertion can be difficult.
AU  - A E Cooper
PY  - 1991
DO  - 10.1111/j.1365-2044.1991.tb09951.x
UR  - https://pubmed.ncbi.nlm.nih.gov/1781556/
ID  - 1781556
ER  -