_{37. Graff-Radford SB, Reeves JL, Jaeger B: Management of head and neck pain: The effectiveness of altering peipetuating factors in myofascial pain. Headache 27:186–190, 1987.}

_{38. Gronbaek E; Cervical anterolateral microsurgery for headache. In: Updating in Headache. Edited by Pfaffenrath V, Lundberg PO, Sjaastad O. Springer Verlag, Berlin, 1985, pp. 17–23.}

_{39. Hameroff SR, Crago BR, Blitt CD, et at.: Comparison of bupivacaine, etidocaine, and saline for trigger-point therapy. Anesth Analg 60:752–755, 1981.}

_{40. Hammond SR, Danta G: Occipital neuralgia. Clin Exp Neurol 15:258–279, 1978.}

_{41. Hatch JP, Moore PJ, Cyr-Provost M, etal.: The use of electromyography and muscle palpation in the diagnosis of tension-type headache with and without pericranial muscle involvement. Pain 49:175–178, 1992.}

_{42. Hay KM; Pain thresholds in migraine. Practitioner 222:827–833, 1979.}

_{43. Haynes SN, Cuevas J, Gannon LR: The psychophysiological etiology of muscle-contraction headache. Headache 22:122–132, 1982.}

_{44. Hendler N, Fink H, Long D: Myofascial Syndrome: Response to trigger point injections. Psychosomatics 24:990–999, 1983.}

_{45. Hoheisel U, Mense S, Simons DG, et al.: Appearance of new receptive fields in rat dorsal horn neurons following noxious stimulation of skeletal muscle: a model for referred muscle pain? Neuroscience Letters 153:9—12, 1993.}

_{45a. Hong CZ, Chen YN, Twehous D, et at.: Pressure threshold for referred pain by compression on the trigger point and adjacent areas. J Musculoske Pain 4 (3): 61–79, 1996.}

_{46. Hubbard DR, Berkoff GM: Myofascial Trigger Points Show Spontaneous Needle EMG Activity. Spine 78:13; 1803–1807, 1993.}

_{47. Hunter CR, Mayfield FH: Role of the upper cervical roots in the production of pain in the head. Am J Surg 78:743–751, 1949.}

_{48. Huskisson EC: Visual analog scales. In. Pain Measurement and Assessment. Edited by Melzack R. Raven Press, New York, 1973, pp. 33–37.}

_{49. Huskisson EC: Measurement of pain. Lancet 2:127–131, 1974.}

_{50. Jaeger B: Are «cervicogenic» headaches due to myofascial pain and cervical spine dysfunction? Cephalalgia 9:157–164, 1989.}

_{51. Jaeger B: Tension-type headache and myofascial pain. In: Orofacial Pain and Temporomandibular Disorders. Edited by Fricton JR, Dubner RB. Raven Press, New York, 1995, pp. 205–213.}

_{52. Jaeger B, Reeves JL: Quantification of changes in myofascial trigger point sensitivity with the pressure algometer. Pain 27:203–210, 1986.}

_{53. Jaeger B, Reeves JL, Graff-Radford SB: A psychophysiological investigation of myofascial trigger point sensitivity vs. EMG activity and tension headache. Cephalalgia 5(Suppl 3):68–69, 1985.}

_{54. Jaeger B, Skootsky SA, Cueva LA: Myofascial pain is common in tension-type headaches. Proceedings of the American Pain Society:43, 1991.}

_{55. Jensen K, Tuxen C, Olesen J: Pericranial muscle tenderness and pressure pain threshold in the temporal region during common migraine. Pain Supplement 4:S574, 1987.}

_{56. Jensen K, Bulow P, Hansen H; Experimental tooth clenching in common migraine. Cephalalgia 5:245–251, 1985.}

_{57. Koch H: The management of chronic pain in officebased ambulatory care. National Ambulatory Medical Care Survey. Advance Data from Vital and Health Statistics. No. 123. DHHS Pub. No.(PHS)84-1250. Public Health Service, Hyattsville, MD, 1986.}

_{58. Kune A: Significant factors pertaining to the results of trigeminal tractotomy. In: Trigeminal Neuralgia. Edited by Hassler R, Walker AE. Stuttgart, Georg Thieme Verlag, 1970, pp. 90—100.}

_{59. Langemark M, Jensen K: Myofascial mechanisms of pain. In: Basic Mechanisms of Headache. Edited by Olesen J, Edvinsson L. Elsevier Science Publishers В. V., Amsterdam, 1988, pp. 331–341.}

_{60. Langemark M, Jensen K, Jensen, TS, et al.: Pressure pain thresholds and thermal nociceptive thresholds in chronic tension-type headache. Pain 38:203–210. 1989.}

_{61. Langemark M, Olesen J: Pericranial tenderness in tension headache. Cephalalgia 7:249–255, 1987.}

_{62. Laskin DM; Etiology of the pain-dysfunction syndrome. J Am Dent Assoc 79:147–153, 1969.}

_{63. Lewit K: The needle effect in the relief of myofascial pain. Pain 6:83–90, 1979.}

_{64. Lewit K: Muscular pattern in thoraco-lumbar lesions. Manual Med 2:105–107, 1986.}

_{65. Lobbezoo-Scholte AM, De Wijer A, Steenks MH, et al: Interexaminer reliability of six orthopedic tests in diagnostic subgroups of craniomandibular disorders. J Oral Rehabil 27:273–265, 1994.}

_{66. Lous I, Olesen J: Evaluation of pericranial tenderness and oral function in patients with common migraine, muscle contraction headache and combination headache. Pain 12:385–393, 1982.}

_{67. Lundervold A: Electromyographic investigations during sedentary work, especially typing. Br J Phys Med 14:32–36, 1951.}

_{68. Lundh H, Westesson PL: Long term followup after occlusal treatment to correct abnormal temporomandibular joint disc position. Oral Surg Oral Med Oral Pathol 67:2—10, 1989.}

_{69. Lundh H, Westesson PL, Kopp S, et al.: Anterior repositioning splint in the treatment of temporomandibular joints with reciprocal clicking: Comparison with a flat occlusal splint and an untreated control group. Oral Surg Oral Med Oral Pathol 60:131–136, 1985.}

_{70. Magnusson T, Carlsson GE, Egermark I: Changes in clinical signs of craniomandibular disorders from the age of 15 to 25 years. J Orofacial Pain 8:201–215, 1994.}

_{71. Matthew NT, Kurman R, Perez F: Drug induced refractory headache — clinical features and management. Headache 30(10):634–638, 1990.}

_{72. McNeill C: Temporomandibular Disorders: Guidelines for Classification, Assessment, and Management. Quintessence, Chicago, 1993.}

_{73. McNulty WH, Gewirtz RN, Hubbard DR, et al.: Needle electromyographic evaluation of trigger point response to a psychological stressor. Psychophysiology 31:3I3—316, 1994.}

_{74. Melzack R, Torgeson WS: On the language of pain. Anesthesiology 34:50, 1971.}

_{75. Mense S: Referral of muscle pain: new aspects. Am Pain Soc J 3:1–9, 1994.}

_{76. Mense S, Simons DG, Russell J: Muscle Pain. Williams and Wilkins, 1999.}

_{77. Nassif J, Hilsen K: Screening for temporomandibular disorders: History and clinical examination. J Prosthodont 1:42–46, 1992.}

_{78. Okeson JP: The effects of hard and soft splints on nocturnal bruxism. J Am Dent Assoc 114:788–791, 1987.}

_{79. Okeson JP (ed): Orofacial Pain. Guidelines for Assessment, Diagnosis, and Management. American Academy of Orofacial Pain. Quintessence Publishing Co, Chicago, 1996.}

_{80. Olesen J: Some clinical features of the acute migraine attack. An analysis of 750 patients. Headache 18:268–271, 1978.}

_{81. Olesen J: Classification and diagnostic criteria for headache disorders, cranial neuralgias and facial pain. Cephalalgia 8(Suppl 7), 1988.}

_{82. Olesen J: Clinical and pathophysiological observations in migraine and tension-type headache explained by integration of vascular, supraspinal and myofascial inputs. Pain 46:125–132, 1991.}

_{83. Peterson AL, Talcott GW, Kelleher WJ, et al.: Site specificity of pain and tension in tension-type headaches. Headache 35(2):89–92, 1995.}

_{84. Pfaffenrath V, Dandekar R, Mayer ET, et al.: Cervicogenic headache: Results of computer-based measurements of cervical spine mobility in 15 patients. Cephalalgia 8:45–48 1988}