Maternal vitamin D deficiency is associated with preterm birth in HIV-infected women - Jao, Jennifer; Freimanis, Laura; Mussi-Pinhata, Marisa Márcia; Cohen, Rachel; Monteiro, Jacqueline Pontes; Cruz, Maria Leticia S; Branch, Andrea; Sperling, Rhoda S; Siberry, George K (Conference on Retroviruses and Opportunistic Infections (CROI), 2016)