Atrial fibrillation and future risk of venous thromboembolism:the Tromsø study - Enga, Kristin Fjeldstad; Rye Holmboe, Ina; Mathisen Hald, Erin; Løchen, Maja-Lisa; Mathiesen, Ellisiv B.; Njølstad, Inger; Wilsgaard, Tom; Brækkan, Sigrid Kufaas; Hansen, John-Bjarne (Journal of Thrombosis and Haemostasis, 2014)