1 HIV/Infectious Diseases Unit, "Villa Maraini" Foundation, Rome/Infectious Diseases Unit, "San Camillo de Lellis" Hospital, Rieti, Italy.
2 Department of Paediatrics and Child Health, School of Medicine, College of Health Sciences, Makerere University/Research Department, Joint Clinical Research Centre, Kampala, Uganda.
3 Department of Microbiology & Immunology, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand.