More Groups
Fewer Groups
More People
Fewer People
More Years
Fewer Years
Arbit, E.; Shah, J.; Bedford, R.; Carlon, G. Journal of Neurosurgery (1991)
Sundaresan, N.; Galicich, J. H.; Lane, J. M.; Bains, M. S.; McCormack, P. Journal of Neurosurgery (1985)