JAK2 and deep vein thrombosis: Patients with positive JAK2 V617F mutation were associated with higher odds in presence of previous thrombosis (OR = 2.624, 95% CI 1.717, 4.009), old age (> 60 years) (OR = 1.691, 95% CI 1.215, 2.354) and presence of hypertension (OR = 1.688, 95% CI 1.234, 2.310).