Incidence of low-level viremia and its impact on virologic failure among people living with HIV-1 who switched to elvitegravir-based antiretroviral therapy oleh Jen-Yu Hsu, Hsin-Yun Sun, Tan-Wen Hsieh, Sui-Yuan Chang, Yu-Chung Chuang, Yu-Shan Huang, Ching-Yu Hsiao, Yi-Ching Su, Wen-Chun Liu, Shu-Fang Chang, Chien-Ching Hung