1 Laboratory of Molecular and Cellular Virology, Institute of Biomedical Sciences, Faculty of Medicine, Universidad de Chile, Santiago, Chile. rsotorifo@uchile.cl.
2 HIV/AIDS Workgroup, Faculty of Medicine, Universidad de Chile, Santiago, Chile. rsotorifo@uchile.cl.
3 Millennium Institute in Immunology and Immunotherapy, Santiago, Chile. rsotorifo@uchile.cl.