1. a Department of Occupational Therapy , School of Health Professions, Tel Aviv University , P.O.B. 39040, Tel Aviv , 69978 , Israel
2. b The Motion Analysis Laboratory, Sheba Medical Center , Tel Hashomer , 52662 , Israel
3. c Bio-Engineering Department , Tel Aviv University , Tel Aviv , 69978 , Israel
4. d Department of Epidemiology , Sackler School of Medicine, Tel Aviv University , Tel Aviv , 69978 , Israel