1. Department of Cardiology, Heart Centre, Central Clinic in Bad Berka, Bad Berka, Germany;
2. Department of Cardiology, Minia University, Menia Governorate, Egypt;
3. Department of Cardiothoracic Surgery, Cairo University, Giza Governorate, Egypt;
4. Department of Cardiology, Misr University for Science and Technology Giza Governorate, Egypt;
5. Department of Anesthesia and Intensive Care Medicine, Germany;
6. Department of Cardiology, University of Jena, Jena, Germany