1. Heart disease and stroke statistics-2012 update: a report from the American Heart Association [published correction appears in Circulation. 2012;125:e1002];Roger;Circulation,2012
2. Heart disease and stroke statistics-2010 update: a report from the American Heart Association [published correction appears in Circulation. 2011;124:e425];Lloyd-Jones;Circulation,2010
3. American Heart Association http://www.circ.ahajournals.org/content/119/3/e21.full.pdf 2011
4. US Department of Health and Human Services http://www.cdc.gov/dhdsp/data_statistics/fact_sheets/docs/fs_heart_failure.pdf 2011
5. DOT-HF Investigators. Intrathoracic impedance monitoring, audible patient alerts, and outcome in patients with heart failure;Van Veldhuisen;Circulation.,2011