[1] Natl & Kapodistrian Univ Athens, Evangelismos Hosp, Dept Neurosurg, Athens, Greece
[2] Univ Hosp Ioannina, Dept Neurosurg, Ioannina, Greece
[3] Natl & Kapodistrian Univ Athens, Hippokrat Hosp, Med Sch, Dept Cardiol 1, Athens, Greece
[4] Mediterraneo Hosp, Dept Neurol, Athens, Greece
[5] Ohio State Univ, Dept Cardiovasc Med, Columbus, OH 43210 USA
[6] Childrens Hosp Agia Sofia, Dept Neurosurg, Athens, Greece