Couples at risk for HIV infection in Southern India: characteristics of HIV-infected patients in concordant and discordant heterosexual relationships. - Kumarasamy, N.; Venkatesh, K. K.; Srikrishnan, A. K.; Prasad, L.; Balakrishnan, P.; Murugavel, K. G.; Thamburaj, E.; Solomon, S.; Mayer, K. H. (International Journal of STD & AIDS, 2010)