DaVita Inc. is a provider of dialysis services in the United States for patients suffering from chronic kidney failure, which is an end stage renal disease (ESRD). As of December 31, 2010, the Company operated or provided administrative services to 1,612 outpatient dialysis centers located in 42 states and the District of Columbia, serving approximately 125,000 patients. DaVita also provides acute inpatient dialysis services in approximately 750 hospitals and related laboratory services. In September 2011, it acquired DSI Renal, Inc. (DSI). In November 2011, the Company announced that its wholly owned European subsidiary DV Care GmbH, has acquired ExtraCorp AG. In January 2012, the Company acquired controlling interest in NephroLife.