TY  - RPRT
TI  - Unexpected difficult intubation caused by subglottic ring.
AU  - A Ceron
AU  - V Ambroselli
AU  - C Zannoni
AU  - D Bertollo
PY  - 2000
DO  - 10.1046/j.1365-2044.2000.01479-10.x
UR  - https://pubmed.ncbi.nlm.nih.gov/10866733/
ID  - 10866733
ER  -