Google yesterday launched its long-awaited online personal health record service dubbed Google Health.

The web portal, found at google.com/health, is the latest entrant into a field of several, including WebMD, Microsoft and Revolution Health, offering personal health records online.

Earlier this year, Google and the Cleveland Clinic conducted a 2-month pilot of the service. The project, limited to 1,600 patients, was quickly oversubscribed.

Google said it will not be selling ads on Google Health and what information is shared with doctors, clinics or pharmacies is controlled by the individual.

More than two dozen companies and institutions announced partnerships with Google Health, including Walgreens, CVS, the American Heart Association, Quest Diagnostics, Beth Israel Deaconess Medical Center and the Cleveland Clinic.

Marissa Mayer, Google’s VP of search products, told the New York Times that Google Health represents a “large ongoing initiative” by the company, which she said she hoped would eventually include “thousands of partners and millions of users.”