1. National Institute of Allergy and Infectious Diseases and National Institute of Arthritis and Musculoskeletal and Skin Diseases, NIH; Bethesda Maryland
2. National University of Athens; Athens Greece
3. National Institute of Allergy and Infectious Diseases; NIH, Bethesda Maryland
4. National Institute of Arthritis and Musculoskeletal and Skin Diseases, NIH; Bethesda Maryland
5. National Institute of Dental and Craniofacial Research, NIH; Bethesda Maryland