1. Department of Microbiology, Tumor and Cell Biology, Karolinska Institute, Stockholm, Sweden.
2. Theoretical Biology and Biophysics, MS K710, Los Alamos National Laboratory, Los Alamos, New Mexico.
3. Infectology Center of Latvia, Riga, Latvia.
4. HIV/AIDS Program Unit of the Infectology Centre of Latvia, Riga, Latvia.
5. Department of Clinical Microbiology, Karolinska University Hospital, Solna, Stockholm, Sweden.