1. Faculty of Medicine, Fayoum University, Fayoum, Egypt
2. Faculty of Medicine, Elrazi University, Khartoum, Sudan
3. Faculty of Medicine, The Hashemite University, Zarqa, Jordan
4. Faculty of Medicine, University of Algiers, Algiers, Algeria
5. Georgetown University, Washington DC
6. 1st Faculty of Medicine, Charles University, Prague, Czech Republic
7. Division of Plastic and Reconstructive Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA