Letter to the Editor: Simpson grading system.
Saitama Medical Center, Saitama Medical University, Saitama, Japan.
Soichi
S
Oya
D002648:Child; D006801:Humans; D008577:Meningeal Neoplasms / Q000601:surgery*; D008579:Meningioma / Q000601:surgery*; D019635:Neurosurgical Procedures; D014944:World Health Organization