Letter: Neurosurgical manpower.
D001932:Brain Neoplasms / Q000601:surgery; D006782:Hospitals, Special; D006801:Humans; D007405:Intervertebral Disc Displacement / Q000601:surgery; D002532:Intracranial Aneurysm / Q000601:surgery; D009493:Neurosurgery; D014481:United States; D000078329:Workforce