[1] Univ Florida, Mech & Aerosp Engn, Gainesville, FL USA
[2] Boston Univ, Phys Therapy, Boston, MA 02215 USA
[3] Boston Univ, Sch Med, Rheumatol, Boston, MA 02118 USA
[4] VA Boston Healthcare Syst, Radiol, West Roxbury, MA USA
[5] Univ Erlangen Nurnberg, Radiol, Erlangen, Germany
[6] Boston Univ, Sch Med, Radiol, Boston, MA 02118 USA
[7] Univ Kansas, Rehabil Med, Med Ctr, Kansas City, KS USA
[8] Univ Iowa, Epidemiol, Iowa City, IA USA
[9] Univ Alabama Birmingham, Epidemiol, Birmingham, AL USA
[10] Univ Calif San Francisco, Epidemiol & Biostat, San Francisco, CA 94143 USA
[11] Boston Univ, Sch Med, Computat Biomed, Boston, MA 02118 USA
[12] Boston Univ, Comp Sci, Boston, MA 02215 USA