Vitamin D3 decreases parathyroid hormone in HIV-infected youth being treated with tenofovir: A randomized, placebo-controlled trial - Havens, P L; Stephensen, C B; Hazra, R; Flynn, P M; Wilson, C M; Rutledge, B; Bethel, J; Pan, C G; Woodhouse, L R; Van Loan, M D; Liu, N; Lujan-Zilbermann, J; Baker, A; Kapogiannis, B G; Mulligan, K (Clin Infect Dis, 2012)