[1] Mt Sinai Sch Med, Div Endocrinol, Mt Sinai Bone Program, New York, NY 10029 USA
[2] Univ Pittsburgh, Dept Pathol, Pittsburgh, PA USA
[3] Univ Pittsburgh, Dept Cell Biol, Pittsburgh, PA USA
[4] Univ Kansas, Med Ctr, Kansas City, MO USA
[5] Univ Bari, I-70121 Bari, Italy