Follow-Up Patients will be monitored for 2 periods of follow-up: short-term and long-term. Short-term follow-up is defined as the time between patient referral and the completion of the diagnostic procedures (within 72 hours). Patients will be trained to return or to contact physicians during this period in case of: 1) worsening of respiratory symptoms; 2) signs and symptoms suggestive of developing deep venous thrombosis of the legs; 3) major and minor bleeding during protective anticoagulation; 4) any other reason for hospitalisation due to VTE-related symptoms.