1. HIV/AIDS surveillance report, 2004;Centers for Disease Control and Prevention (CDC),2006
2. Short term estimates of adult HIV incidence by mode of transmission: Kenya and Thailand as examples;Gouws;Sex Transm Infect,2006
3. HIV/AIDS surveillance report, 2003;Centers for Disease Control and Prevention (CDC),2006
4. Sexual transmission of HIV;Royce;N Engl J Med,1997
5. Coital frequency among married and cohabiting couples in the United States;Rao;J Biosoc Sci,1995