Nonambulant children with CP ( n = 41 ; Gross Motor Function Classification System level IV = 3 , level V = 38 ; mean age 7.1 years , range 2.3-16 years , 66 % male ) were randomly allocated to receive either intramuscular BoNT-A injections ( n = 23 ) or sham procedure ( n = 18 ) combined with therapy .