NEW YORK (AP) — Since Robert F. Kennedy Jr. was sworn in to lead the U.S. Department of Health and Human Services one year ago , he has defended his upending of federal health policy by saying the changes will restore trust in America’s public health agencies. But as the longtime leader of the anti-vaccine movement scales back immunization guidance and dismisses scientists and advisers, he’s clashed with top medical groups who say he’s not following the science . The confrontation is deepening