[1] Fed Univ Sao Paulo UNIFESP, Neurosurg Dept, Rua Pedro de Toledo 715,6th Floor, BR-04024001 Sao Paulo, SP, Brazil
[2] Nationwide Childrens Hosp, Dept Pediat Neurosurg, 700 Childrens Dr, Columbus, OH 43205 USA
[3] Fed Univ Sao Paulo UNIFESP, Dept Obstet, Rua Pedro de Toledo 715,8th Floor, BR-04024001 Sao Paulo, SP, Brazil
[4] Nationwide Childrens Hosp, Neurosurg Dept, FB, Suite 4 A-2,700 Childrens Dr, Columbus, OH 43205 USA