TY  - GEN
AU  - Kopp,Vincent J
TI  - Counting backward
SN  - 1528-1175
PY  - 2013///0618
KW  - Anesthesia
KW  - psychology
KW  - Anesthetics, Inhalation
KW  - Ether
KW  - History, 20th Century
KW  - Hospitals
KW  - history
KW  - Tonsillectomy
KW  - United States
N1  - Publication Type: Historical Article; Journal Article
UR  - https://doi.org/10.1097/ALN.0b013e318273e290
ER  -