Altered Osteoprotegerin/RANKL Ratio and Low Bone Mineral Density in Celiac Patients on Long-term Treatment with Gluten-free Diet - Fiore, C E; Pennisi, P; Ferro, G; Ximenes, B; Privitelli, L; Mangiafico, R A; Santoro, F; Parisi, N; Lombardo, T (Hormone and Metabolic Research, 2006)