RT Journal Article SR Electronic T1 Shingles vaccine may help cut dementia risk, study suggests JF BMJ JO BMJ FD British Medical Journal Publishing Group SP r722 DO 10.1136/bmj.r722 VO 389 A1 Iacobucci, Gareth YR 2025 UL https://www.bmj.com/content/389/bmj.r722.abstract AB