One year after CVS Health acquired Aetna to create a $195-billion healthcare giant – now the eighth largest corporation on the Fortune 500 – integration and innovation continues, notably with the rollout of the firm’s so-called HealthHUBs, president and CEO Larry J. Merlo told The Journal in an extended interview. Launched earlier this year in Houston, the company’s growing number of HealthHUBs offer a variety of healthcare products and services, including management of chronic diseases and connections to primary-care doctors and other providers. @gwaynemiller #podcast for @projo   Story only at providencejournal.com