[1] Univ Calif San Francisco, Dept Phys Therapy & Rehabil Sci, San Francisco, CA 94143 USA
[2] San Francisco State Univ, Grad Program Phys Therapy, San Francisco, CA 94132 USA
[3] Univ Calif San Francisco, Dept Radiol, San Francisco, CA 94143 USA
[4] Johns Hopkins Sch Med, Div Endocrinol, Baltimore, MD USA