According to the British Thoracic Society, which of the following is NOT a major risk factor for a pulmonary embolus?

c. Major risk factors for pulmonary emboli include:

• Immobility.

• Abdominal/pelvic surgery.

• Malignancy (abdominal/pelvic/advanced metastatic).

• Lower limb fracture.

• Pregnancy.

• Hip/knee replacement.

• Previous venous thromboembolism.

Minor risk factors include:

• Oral contraceptive pills.

• HRT.

• Long-distance travel.