TY - JOUR AU - Olesen, JB; Lip, GY; Hansen, ML TI - Validation of risk stratification schemes for predicting stroke and thromboembolism in patients with atrial fibrillation: nationwide cohort study JO - Br Med J VL - 342 PY - 2011 DO - 10.1136/bmj.d124 L3 - PubMed-ID: 21282258 SP - d124 N1 - doi: 10.1136/bmj.d124 ER -