1. Department of Clinical Nutrition and Dietetic, Hashemite University, Zarqa, Jordan
2. Gastroenterology Division, King Hussein Cancer Center, Amman, Jordan
3. Department of Nutrition and Food Technology, Jordan University of Science and Technology, Irbid, Jordan
4. Faculty of Medicine, Hashemite University, Zarqa, Jordan
5. Department of General and Pediatric Surgery, Jordan University of Science and Technology, Irbid, Jordan
6. Gastroenterology Division, Prince Hamza Hospital, Amman, Jordan
7. Cancer Prevention and Control Program, Moores Cancer Center, University of California-San Diego, La Jolla, California