ソース:[1] Aetna Expands Hospital Program To Cut Readmissions (https://finance.yahoo.com/news/aetna-expands- ...)[2] Aetna Expands Clinical Collaboration Program to Enhance Support for Hospitals and Provide Personalized Member Care - CVS Health (https://vertexaisearch.cloud.google.com/groun ...)[3] Charted: More hospitals to face readmission penalties in 2026 - Advisory Board (https://vertexaisearch.cloud.google.com/groun ...)