34 Journal of the American Medical Association, JAMA/HIV/AIDS, vol. 5, No. 3, May/June 99; and Safeworks Aids project, www.safeworks.org.
34 Journal of the American Medical Association, JAMA/HIV/AIDS, vol. 5, No. 3 mayo/junio de 1999; y Safeworks Aids project,www.safeworks.org.