[1] Duke Global Neurosurg & Neurol, Durham, NC 27710 USA
[2] Duke Univ, Med Ctr, Dept Neurosurg, Durham, NC 27708 USA
[3] Asokoro Dist Hosp, Neurosurg Unit, Abuja Fct, Nigeria
[4] Univ Florida, Lillian S Wells Dept Neurosurg, Gainesville, FL USA
[5] Duke Univ, Med Ctr, Lib & Arch, Durham, NC USA
[6] Univ Cape Town, Div Neurosurg, Cape Town, South Africa
[7] Univ Ibadan, Dept Neurol Surg, Coll Med, Ibadan, Nigeria
[8] Duke Univ, Duke Global Hlth Inst, Durham, NC USA