1. Louisiana State University; Neurology; 1111 Medical Center Boulevard Suite S-750 Marrero Louisiana USA 77072
2. Hospital de São José; Department of Neurosurgery; Rua José António Serrano Lisboa Portugal 1150-199
3. University of Texas - MD Anderson Cancer Center; 1515 Holcombe Boulevard Neuro-Oncology Department, Box 431 Houston Texas USA 77030