[1] HARLEM HOSP CTR, DEPT SURG, NEUROSURG SERV, NEW YORK, NY USA
[2] HARLEM HOSP CTR, DEPT NEUROL, NEW YORK, NY USA
[3] COLUMBIA UNIV, COLL PHYS & SURG, DEPT NEUROSURG, NEW YORK, NY USA
[4] COLUMBIA UNIV, COLL PHYS & SURG, DEPT NEUROL, NEW YORK, NY USA