1 Department of Neurosurgery, Weill Cornell Medical College, New York Presbyterian Hospital, New York.
2 Department of Orthopedics, Muhimbili Orthopedic Institute (MOI), Dar es Salaam, Tanzania ; Department of Neurosurgery, Muhimbili Orthopedic Institute (MOI), Dar es Salaam, Tanzania.
3 Department of Orthopedics, Muhimbili Orthopedic Institute (MOI), Dar es Salaam, Tanzania.
4 Department of Neurosurgery, Muhimbili Orthopedic Institute (MOI), Dar es Salaam, Tanzania.