Normal Circulating PTH in Saudi Healthy Individuals with Hypovitaminosis D - Al-Saleh, Y; Al-Daghri, N M; Alkharfy, K M; Al-Attas, O S; Alokail, M S; Al-Othman, A; Sabico, S; Chrousos, G P (Horm Metab Res, 2013)