[1] Minist Social Affairs, Div Mental Retardat, Off Med Director, Natl Inst Child Hlth & Human Dev, Jerusalem, Israel
[2] Ariel Univ, Ctr Samaria, Dept Phys Therapy, Ariel, Israel
[3] Chaim Sheba Med Ctr, Natl Rett Syndrome Clin, Natl Evaluat Team, Israeli Rett Syndrome Assoc, Ramat Gan, Israel
[4] Univ Kentucky, Kentucky Childrens Hosp, Lexington, KY 40506 USA
[5] Ben Gurion Univ Negev, Fac Hlth Sci, Dept Family Med, Beer Sheva, Israel