The mean passive cervical rotational range of motion measured at three months posttreatment was significantly greater in Group @ ( @ ) than that in Group @ ( @ ) , and the thickness , cross-sectional area , and red pixel intensity of the affected sternocleidomastoid muscle were all less in Group @ ( @ mm , @ mm ( @ ) , and @ , respectively ) than those in Group @ ( @ mm , @ mm@ , and @ , respectively ) .