[1] Kingston Hlth Sci Ctr, Div Neurosurg, Kingston, ON, Canada
[2] Queens Univ, Fac Hlth Sci, Dept Surg, Kingston, ON, Canada
[3] Univ Alabama Birmingham, Dept Neurol Surg, Birmingham, AL USA
[4] Childrens Alabama Hosp, Div Neurosurg, Birmingham, AL USA
[5] Viet Nam Natl Canc Hosp, Dept Neurosurg, Hanoi, Vietnam
[6] Childrens Hosp 2, Dept Neurosurg, Ho Chi Minh City, Vietnam
[7] Viet Nam Natl Chrildrens Hosp, Dept Neurol, Hanoi, Vietnam
[8] Viet Nam Natl Childrens Hosp, Dept Neurosurg, Hanoi, Vietnam