1. Simons DG, Travell JG, Simons LS: Myofascial pain and dysfunction: the trigger point manual. In Upper Half of Body vol 1, edn 2. Baltimore: Williams and Wilkins; 1999.Is very helpful in the diagnosis of myofascial pain.
2. Kaergaard A, Anderson JH: Musculoskeletal disorders of the neck and shoulders in female sewing machine operators: prevalence, incidence, and prognosis. Occup Envir Med 2000, 57:528–534.
3. Jensen R: Pathophysiologica; mechanisms of tension-type headache: a review of epidemiological and experimental studies. Cephalalgia 1999, 19:602–621.
4. Drewes AM, Jennum P: Epidemiology of myofascial pain, low back pain, morning stiffness and sleep related complaints in the general population [abstract]. J Musculoskeletal Pain 1995, 3(suppl 1):68.
5. Sola AE, Bonica JJ: Myofascial pain syndromes. In The management of pain. edn 2. Edited by Bonica JJ. Philadelphia:Lea & Feiberger; 1990:352–367.