Tenofovir-linked hyperparathyroidism is independently associated with the presence of vitamin D deficiency - Rosenvinge, M M; Gedela, K; Copas, A J; Wilkinson, A; Sheehy, C A; Bano, G; Hay, P E; Pakianathan, M R; Sadiq, S T (J Acquir Immune Defic Syndr, 2010)