1. Center for Engineering in Medicine and Surgery, Massachusetts General Hospital Harvard Medical School Boston Massachusetts USA
2. Shriners Hospitals for Children in Boston Boston Massachusetts USA
3. Electron Microscopy Research Department Theodor Bilharz Research Institute (TBRI) Giza Egypt
4. Immunology and Therapeutic Evaluation Department TBRI Giza Egypt
5. Pathology Department, Kasr Al Ainy, Faculty of Medicine Cairo University Giza Egypt