[1] Univ Coll Hosp, Dept Neurosurg, Ibadan, Nigeria
[2] Duke Univ, Div Global Neurosurg & Neurol, Durham, NC 27708 USA
[3] Johns Hopkins Univ, Sch Med, Dept Neurosurg, Baltimore, MD USA
[4] Duke Univ, Duke Global Hlth Inst, Durham, NC USA
[5] Duke Univ, Sch Med, Durham, NC USA
[6] Nnamdi Azikiwe Univ Teaching Hosp, Dept Surg, Nnewi, Nigeria
[7] Babcock Univ Teaching Hosp, Dept Surg, Ilishan Remo, Nigeria
[8] Lagoon Hosp, Dept Surg, Lagos, Nigeria
[9] Aminu Kano Teaching Hosp, Dept Surg, Kano, Nigeria
[10] Lagos State Univ Teaching Hosp, Dept Surg, Ikeja, Lagos, Nigeria
[11] Univ Maiduguri Teaching Hosp, Dept Surg, Maiduguri, Nigeria
[12] Univ Abuja Teaching Hosp, Dept Surg, Gwagwalada Zuba, Nigeria
[13] Delta State Univ Teaching Hosp, Dept Surg, Oghara, Nigeria
[14] Fed Med Ctr, Dept Surg, Owo, Nigeria
[15] Washington Univ, Sch Med, St Louis, MO USA
[16] Univ Cambridge, Sch Clin Med, Cambridge, England
[17] Imo State Specialist Hosp, Dept Surg, Owerri, Nigeria
[18] Rivers State Univ Teaching Hosp, Dept Surg, Port Harcourt, Nigeria
[19] Duke Univ, Med Ctr, Dept Neurosurg, Durham, NC 27708 USA
[20] Univ Nigeria Teaching Hosp, Dept Surg, Enugu, Nigeria