[1] Univ Sheffield, Acad Unit Bone Metab, Sheffield, S Yorkshire, England
[2] Univ Calif San Francisco, San Francisco Coordinating Ctr, San Francisco, CA 94143 USA
[3] Calif Pacific Med Ctr, Res Inst, San Francisco, CA USA
[4] Oregon Hlth & Sci Univ, Portland, OR 97201 USA
[5] Univ Calif San Diego, San Diego, CA 92103 USA
[6] VA Med Ctr, Minneapolis, MN USA
[7] Univ Minnesota, Minneapolis, MN USA