Sept. 15 (UPI) -- A new study demonstrating the effectiveness of acupuncture in relieving chronic lower back pain among seniors is fueling calls to expand Medicare coverage for the procedures amid the continuing struggle to reduce opioid abuse. In a large-scale, randomized study published Friday in JAMA Open Network, researchers from the Kaiser Permanente Center for Health Research and elsewhere found that acupuncture needling yielded greater improvements in back pain-related disability at six