[1] Baylor Coll Med, Dept Ophthalmol, Houston, TX 77030 USA
[2] Baylor Coll Med, Dept Urol, Houston, TX 77030 USA
[3] Baylor Coll Med, Dept Neurol, Houston, TX 77030 USA
[4] Baylor Coll Med, Dept Neurosurg, Houston, TX 77030 USA
[5] Univ Texas, MD Anderson Canc Ctr, Dept Neurosurg, Houston, TX 77030 USA
[6] Methodist Hosp, Anesthesiol Serv, Houston, TX 77030 USA
[7] Univ Texas, Med Branch, Dept Ophthalmol, Galveston, TX 77550 USA