Summary: Canadian Cardiovascular Society Atrial Fibrillation Guidelines 2010: Etiology and Initial Investigations http://www.onlinecjc.ca/article/S0828-282X(10)00016-4/fulltext CHADS2 Score http://www.mdcalc.com/chads2-score-for-atrial-fibrillation-stroke-risk/ HAS-BLED Score http://www.mdcalc.com/has-bled-score-for-major-bleeding-risk/ Mayo Clinic on A Fib http://www.mayoclinic.org/diseases-conditions/atrial-fibrillation/basics/definition/con-20027014
