[1] Assaf Harofeh Med Ctr, Human Mot Anal Lab, IL-70300 Zerifin, Israel
[2] Ben Gurion Univ Negev, Fac Hlth Sci, Beer Sheva, Israel
[3] Jerusalem Princess Basma Ctr Disabled Children, Jerusalem, Israel
[4] Bournemouth Univ, Sch Hlth & Social Care, Bournemouth, Dorset, England
[5] VA Med Ctr, Res Sect, Albuquerque, NM USA
[6] Eunice Kennedy Shriver Natl Inst Child Hlth & Hum, Div Epidemiol, Bethesda, MD USA