Google Health was a personal health information centralization service (sometimes known as personal health record services) by Google introduced in 2008 and announced for withdrawal in 2011. The service allows Google users to volunteer their health records – either manually or by logging into their accounts at partnered health services providers – into the Google Health system, thereby merging potentially separate health records into one centralized Google Health profile. Volunteered information can include "health conditions, medications, allergies, and lab results". Once entered, Google Health uses the information to provide the user with a merged health record, information on conditions, and possible interactions between drugs, conditions, and allergies. Google Health's API is based on a subset of the Continuity of Care Record. Google Health, like many other Google products, is free to use for consumers. Unlike other Google services, however, Health currently contains no advertising. Google has not revealed how it plans to make money with the service, but a Wall Street Journal article says that Google "hasn't ruled [advertising] out for the future." Google has filed U.S. Patent Application #20070282632 ,"Method and apparatus for serving advertisements in an electronic medical record system".