1. American Heart Association. (2010).Heart disease and stroke statistics – 2010 update. Dallas, TX: Author.
2. Greenberg, R. S., Daniels, S. R., Flanders, W. D., Eley, J. W. & Boring, J. R. (2001).Medical epidemiology. New York, NY: McGraw-Hill.
3. Melnyk, M. B. & Fineout-Overholt, E. (2005).Evidence-based practice in nursing and healthcare: A guide to best practice. Philadelphia, PA: Lippincott Williams and Wilkins.
4. Steyerberg, E. W. (2009).Clinical prediction models. A practical approach to development, validation, and updating. New York, NY: Springer Science.