1. Cardiothoracic Surgery Department, Zagazig University, Zagazig, Egypt
2. Cardiothoracic Surgery Department, Mansoura University, Mansoura, Egypt
3. Neurology Department, Zagazig University, Zagazig, Egypt
4. Department of Anesthesiology, Intensive Care and Pain Management, Ain Shams University, Ain Shams, Egypt