High prevalence of vitamin D deficiency in HIV-infected patients: A case–control study - Giusti, A.; Penco, G.; Barone, A.; Pizzonia, M.; Razzano, M.; Feasi, M.; Piscopo, R.; Pontali, E.; Palummeri, E.; Cassola, G.; Pioli, G. (BONE (8756-3282), 2011)