1. Infectious Diseases and Tropical Medicine Research Center, Health Research Institute Babol University of Medical Sciences Babol Iran
2. Student Research Committee Babol University of Medical Sciences Babol Iran
3. Cheshire and Merseyside Health Protection Team Public Health England North West Liverpool UK
4. Scientist, Department of Analytical Biotechnology MedImmune/AstraZeneca Gaithersburg Maryland 20878 USA
5. Department of General Medicine, Rangaraya Medical College NTR University of Health Sciences Vijayawada Andhra Pradesh India