[1] Univ Ind Santander, Escuela Med, Fac Salud, Bucaramanga, Colombia
[2] Johns Hopkins Sch Med, Dept Neurol, Baltimore, MD 21205 USA
[3] Johns Hopkins Sch Med, Dept Ophthalmol, Baltimore, MD 21205 USA
[4] Johns Hopkins Sch Med, Dept Otolaryngol Head & Neck Surg, Baltimore, MD 21205 USA
[5] Johns Hopkins Sch Med, Dept Neurosurg, Baltimore, MD 21205 USA