1. Corporación de Lucha Contra el Sida, Carrera 56 2-120, Cali, Colombia
2. Public Health Science, Queens University, Kingston, Ontario K7L 3N6, Canada
3. Montefiore Medical Center, Moses Division, Albert Einstein College of Medicine, The Oval Center at Montefiore, 3230 Bainbridge Avenue, Bronx, NY 10467, USA
4. School of Nursing, Queen’s University, Kingston, Ontario K7L 3N6, Canada
5. Division of Infectious Diseases, Department of Medicine, Queens University, Kingston, Ontario K7L 3N6, Canada