1. Dermatology Department, St. John's Institute of Dermatology, Guy's Hospital, Guy's, Kings, and St. Thomas' Medical Schools, London, United Kingdom
2. Corporación para Investigaciones Biológicas, Medellin, Colombia
3. Department of Microbiology,University College Hospital, London, United Kingdom
4. Department of Microbiology & Immunology
5. Department of Medicine, Albert Einstein College of Medicine, Bronx, New York