1. Columbia University Vagelos College of Physicians and Surgeons , New York, New York , USA
2. University of Chicago Medical School Pritzker School of Medicine , Chicago, Illinois , USA
3. Department of Medicine and Therapeutics, Korle-Bu Teaching Hospital , Accra , Ghana
4. Department of Neurosurgery, Korle-Bu Teaching Hospital , Accra , Ghana
5. Department of Neurological Surgery, University of Ghana Medical Center , Accra , Ghana