1. Division of Intestinal and Genital Protozoal Diseases, Department of Medical Parasitology and Mycology, School of Public Health and Institute of Public Health Research, Tehran University of Medical Sciences, 14155 Tehran 6446, Iran
2. Division of Infectious Diseases and International Health, Department of Internal Medicine, University of Virginia Health System, Charlottesville, Virginia 22908-1340
3. Department of Microbiology, School of Science, Qom Azad University, Qom, Iran