1. Division of Medical Parasitology, Department of Microbiology and Clinical Microbiology; Gulhane Military Medical Academy; Ankara 06018 Turkey
2. Department of Infectious Diseases; Tokai University School of Medicine, Bohseidai, Isehara; Kanagawa 259-1193 Japan
3. Departments of Medicine, Pathology, and Microbiology; University of Virginia School of Medicine; Charlottesville VA 22908