One web search away. It was apparently a conference presentation but is well reported in medical media: https://newsroom.heart.org/news/heart-attack-risk-halve

One web search away. It was apparently a conference presentation but is well reported in medical media: https://newsroom.heart.org/news/heart-attack-risk-halved-in-adults-with-heart-disease-taking-tailored-vitamin-d-doses https://newsroom.heart.org/news/heart-attack-risk-halved-in-... https://www.hcplive.com/view/target-d-optimized-vitamin-d-dosage-reduces-risk-of-myocardial-infarction-in-heart-disease-patients https://www.hcplive.com/view/target-d-optimized-vitamin-d-do...