Provided is an acrylic rubber composition including an acrylic rubber and a functionalized silicone oil. Specifically the measuring apparatus is provided with a reference optical system separate from a light receiving system. Proliferative disorders include but are not limited to neoplasms. Each foot bar support assembly has an elongated slide plate movably supported within the slot, a hook plate fastened to the slide plate, and a foot bar support arm rotatably and slidably fastened to the hook plate.