Surgical manpower, use of surgical services, and health status.
D000368:Aged; D003362:Cost-Benefit Analysis; D013502:General Surgery; D006262:Health; D006801:Humans; D008297:Male; D008875:Middle Aged; D008962:Models, Theoretical; D013514:Surgical Procedures, Operative / Q000191:economics / Q000401:mortality / Q000706:statistics & numerical data*; D014481:United States; D000078329:Workforce