[1] Katholieke Univ Leuven, Univ Ziekenhuizen, Ctr Metab Bone Dis, B-3000 Louvain, Belgium
[2] Katholieke Univ Leuven, Div Geriatr Med, B-3000 Louvain, Belgium
[3] Katholieke Univ Leuven, Lab Expt Med & Endocrinol, B-3000 Louvain, Belgium
[4] Limburgs Univ Centrum, Diepenbeek, Belgium
[5] Maastricht Univ Hosp, Maastricht, Netherlands
[6] Free Univ Brussels, Dept Traumatol & Emergency Surg, Brussels, Belgium
[7] Jerry L Pettis Mem Vet Adm Med Ctr, Musculoskeletal Dis Ctr, Loma Linda, CA 92354 USA
[8] Loma Linda Univ, Dept Med, Loma Linda, CA 92350 USA
[9] Loma Linda Univ, Dept Biochem, Loma Linda, CA 92350 USA