1. Classification of chronic pain: description of chronic pain syndromes and definition of pain terms;Merskey;Pain,1986
2. Surgical aspects of chronic post-thoracotomy pain;Rogers;Eur J Cardiothorac Surg,2000
3. War wounds of the chest observed at the Thoracic Surgery Centre Walter Reed General Hospital;Blades;J Thorac Surg,1944
4. Chronic pain after thoracic surgery: a follow-up study;Perttunen;Acta Anaesthesiol Scand,1999
5. European Society of Regional Anaesthesia and Pain Therapy. Procedure Specific Postoperative Pain Management (PROSPECT). Available from: http://www.postoppain.org/frameset.htm