TY  - RPRT
TI  - Peroral endoscopy.
AU  - F J PUTNEY
AU  - J J O'KEEFE
AU  - L H CLERF
PY  - 1950
DO  - 10.1001/archotol.1950.00700030309018
UR  - https://pubmed.ncbi.nlm.nih.gov/15433690/
ID  - 15433690
ER  -