WASHINGTON — The Department of Health and Human Services opened a new National Institutes of Health clinic this week to evaluate and study patients who report health problems after vaccination, the centerpiece of a broader push by Secretary Robert F. Kennedy Jr. to document, investigate, and treat what the department calls potential vaccine-related injuries. The clinic opened Oct. 5 on the NIH campus in Bethesda, Maryland. HHS and NIH leaders marked the opening with a ribbon-