1. Department of Oncology; Lombardi Comprehensive Cancer Center; Georgetown University Medical Center; Washington DC USA
2. Department of Chemistry and Biochemistry; Texas Tech University; Lubbock TX USA
3. Department of Mathematics and Statistics; Georgetown University; Washington DC USA
4. Department of Tropical Medicine and Infectious Diseases; Tanta University; Tanta Egypt
5. MedStar Georgetown University Hospital and Georgetown University Medical Center; Washington DC USA
6. Johns Hopkins University; Gastroenterology & Hepatology at Sibley; Washington DC USA