1. Department of Medical Parasitology and Mycology, School of Public Health and Institute of Public Health Research, Tehran University of Medical Sciences, PO Box 14155, Tehran 6446, Iran
2. Department of Pathology, School of Veterinary Medicine, Tehran University, PO Box 14155, Tehran 6453, Iran
3. Division of Infectious Diseases and International Health, University of Virginia Health System, MR4 Building, Lane Road, PO Box 801340, Charlottesville, Virginia 22908-1340 USA