An alternative to the football helmet.
Crausman
R S
RS
al-Bilbeisi
F
F
D002404:Catheterization / Q000295:instrumentation*; D004867:Equipment Design; D004932:Esophageal and Gastric Varices / Q000628:therapy; D006471:Gastrointestinal Hemorrhage / Q000628:therapy; D006801:Humans