Yelp has launched a new feature that adds healthcare information to its online reviews pages for hospitals, nursing homes and dialysis clinics. The San Francisco company said Wednesday that it will provide statistics for 4,600 hospitals, 15,000 nursing homes and 6,300 dialysis clinics in the U.S. The information is compiled by ProPublica from their own research and the Centers for Medicare and Medicaid Services, and will be updated quarterly.