1. Department of Veterinary Medicine, An-Najah National University, P.O. Box 7 Nablus, Palestine.
2. Palestinian Livestock Development Center, Tubas-Palestine.
3. Department of Clinical Veterinary Medical Sciences, Faculty of Veterinary Medicine, Jordan University of Science and Technology, P.O. Box 3030 Irbid, 22110 Jordan.
4. Department of Basic Veterinary Medical Science, Faculty of Veterinary Medicine, Jordan University of Science and Technology, P. O. Box 3030 Irbid, 22110, Jordan.
5. Department of Public Health Sciences, Faculty of Graduate Studies, An-Najah National University, P.O. Box 7 Nablus, Palestine.