[1] Univ Sydney, Rehabil Studies Unit, Sydney, NSW 2006, Australia
[2] Simon Fraser Univ, Sch Engn Sci, Vancouver, BC, Canada
[3] Simon Fraser Univ, Dept Biomed Physiol & Kinesiol, Vancouver, BC, Canada
[4] Washington Univ, Sch Med, Div Geriatr & Nutr Sci, St Louis, MO USA
[5] UKK Inst, Injury & Osteoporosis Res Ctr, Tampere, Finland
[6] Univ British Columbia, Fac Med, Ctr Hip Hlth & Mobil, Vancouver, BC, Canada
[7] Univ Copenhagen, Bispebjerg Hosp, Dept Orthoped & Internal Med, Copenhagen, Denmark
[8] Boston Univ, Dept Social & Behav Sci, Boston, MA 02215 USA
[9] Cardiff Univ, Sch Engn, Cardiff, S Glam, Wales
[10] Natl Hlth Serv, Newcastle Upon Tyne, Tyne & Wear, England
[11] Univ British Columbia, Dept Orthopaed, Vancouver, BC V5Z 1M9, Canada
[12] Univ British Columbia, Dept Mech Engn, Vancouver, BC V6T 1W5, Canada
[13] Swiss Fed Labs Mat Testing & Res Empa, Lab Protect & Physiol, St Gallen, Switzerland
[14] Univ London Imperial Coll Sci Technol & Med, Mech Mat Grp, London, England
[15] Hebrew Senior Life, Inst Aging Res, Boston, MA USA