1. Stevens MB. Tension-type headaches. Am Fam Physician 1993;47:799-806 [review].
2. Davidoff RA. Trigger points and myofascial pain: toward understanding how they affect headaches. Cephalalgia 1998;18:436-48 [review].
3. Jensen R. Pathophysiological mechanisms of tension-type headache: a review of epidemiological and experimental studies. Cephalalgia 1999;19:602-21 [review].
4. Ribeiro CAF. L-5-hydroxytryptophan in the prophylaxis of chronic tension-type headache: a double-blind, randomized, placebo-controlled study. Headache 2000;40:451-6.
5. Edmeads J. Placebos and the power of negative thinking. Headache 1984;24:342-3 [editorial].
6. De Benedittis G, Massei R. Serotonin precursors in chronic primary headache. A double-blind cross-over study with L-5-hydroxytrytophan vs. placebo. J Neurosurg Sci 1985;29:239-48.
7. Longo G, Rudoi I, Iannuccelli M, et al. Treatment of essential headache in developmental age with L-5-HTP (cross over double-blind study versus placebo). Pediatr Med Chir 1984;6:241-5. [in Italian].
8. Prakash S, Shah ND. Chronic tension-type headache with vitamin D deficiency: casual or causal association? Headache 2009;49:1214-22.
9. Göbel H, Schmidt G, Soyka DS. Effect of peppermint and eucalyptus oil preparations on neurophysiological and experimental algesimetric headache parameters. Cephalalgia 1994;14:228-34.
10. Gobel H, Fresenius J, Heinze A, et al. Effectiveness of Oleum menthae piperitae and paracetamol in therapy of headache of the tension type. Nervenarzt 1996;67:672-81 [in German].
11. Schattner P, Randerson D. Tiger Balm as a treatment of tension headache. A clinical trial in general practice. Aust Fam Physician 1996;25(2):216, 218, 220.
12. Melchart D, Linde K, Fischer P, et al. Acupuncture for recurrent headaches: a systematic review of randomized controlled trials. Cephalalgia 1999;19:779-86.
13. Hansen PE, Hansen JH. Acupuncture treatment of chronic tension headache—a controlled cross-over trial. Cephalalgia 1985;5:137-42.
14. Tavola T, Gala C, Conte G, Invernizzi G. Traditional Chinese acupuncture in tension-type headache: a controlled study. Pain 1992;48:325-9.
15. Ahonen E, Hakumaki M, Mahlamaki S, et al. Effectiveness of acupuncture and physiotherapy on myogenic headache: a comparative study. Acupunct Electrother Res 1984;9:141-50.
16. Carlsson J, Augustinsson LE, Blomstrand C, Sullivan M. Health status in patients with tension headache treated with acupuncture or physiotherapy. Headache 1990;30:593-9.
17. Jensen LB, Melsen B, Jensen SB. Effect of acupuncture on headache measured by reduction in number of attacks and use of drugs. Scand J Dent Res 1979;87:373-80.
18. Loh L, Nathan PW, Schott GD, Zilkha KJ. Acupuncture versus medical treatment for migraine and muscle tension headaches. J Neurol Neurosurg Psychiatry 1984;47:333-7.
19. Dowson DI, Lewith GT, Machin D. The effects of acupuncture versus placebo in the treatment of headache. Pain 1985;21:35-42.
20. Kurland HD. Treatment of headache pain with auto-acupressure. Dis Nerv Syst 1976;37:127-9.
21. Goh BMT. Simple treatment of headaches without drugs. Med J Aust 1978;2:271 [letter].
22. Whittington W, Ellis WB, Molyneux TP. The effect of manipulation (toggle recoil technique) for headaches with upper cervical joint dysfunction: a pilot study. J Manipulative Physiol Ther 1994;17:369-75.
23. Schoensee SK, Jensen G, Nicholson G, et al. The effect of mobilization on cervical headaches. J Orthop Sports Phys Ther 1995;21:184-96.
24. Vernon HT. Manipulative therapy in the chiropractic treatment of headaches: a retrospective and prospective study. J Manipulative Physiol Ther 1982;5:109-12.
25. Mootz RD, Dhami MSI, Hess JA, et al. Chiropractic treatment of chronic episodic tension-type headache in male subjects: a case series analysis. J Can Chiro Assoc 1994;38:152-9.
26. Hoyt WH, Shaffer F, Bard DA, et al. Osteopathic manipulation in the treatment of muscle contraction headache. J Am Osteopath Assoc 1979;78:322-5.
27. Vernon HT. Spinal manipulation and headache of cervical origin. J Manipulative Physiol Ther 1989;12:455-68 [review].
28. Boline PD, Kassak K, Bronfort G, et al. Spinal manipulation vs. amitriptyline for the treatment of chronic tension-type headaches: a randomized clinical trial. J Manipulative Physiol Ther 1995;18:148-54.
29. Nilsson N, Christensen HW, Hartvigsen J. The effect of spinal manipulation in the treatment of cervicogenic headache. J Manipulative Physiol Ther 1997;20:326-30.
30. Bove G, Nilsson N. Spinal manipulation in the treatment of episodic tension-type headache: a randomized controlled trial. JAMA 1998;280:1576-9.
31. Hammjill JM, Cook TM, Rosecrance JC. Effectiveness of a physical therapy regimen in the treatment of tension-type headache. Headache 1996;36:149-53.
32. Puustjarvi K, Airaksinen O, Pontinen PJ. The effects of massage in patients with chronic tension headache. Acupunct Electrother Res 1990;15:159-62.
33. Jay GW, Brunson J, Branson SJ. The effectiveness of physical therapy in the treatment of chronic daily headaches. Headache 1989;29:156-62.
34. Rokicki LA, Holroyd KA, France CR, et al. Change mechanisms associated with combined relaxation/EMG biofeedback training for chronic tension headache. Appl Pschophysiol Biofeedback 1997;22:21-41.
35. Bruhn P, Olesen J, Melgaard B. Controlled trial of EMG biofeedback in muscle contraction headache. Ann Neurol 1979;6:34-6.
36. Holroyd KA, Andrasik F, Noble J. A comparison of EMG biofeedback and a credible pseudotherapy in treating tension headache. J Behav Med 1980;3:29-39.
37. Carrobles JA, Cardona A, Santacreu J. Shaping and generalization procedures in the EMG-biofeedback treatment of tension headaches. Br J Clin Psychol 1981;20:49-56.
38. Janssen K. Differential effectiveness of EMG-feedback versus combined EMG-feedback and relaxation instructions in the treatment of tension headache. J Psychosom Res 1983;27:243-53.
39. Bussone G, Grazzi L, D'Amico D, et al. Biofeedback-assisted relaxation training for young adolescents with tension-type headache: a controlled study. Cephalalgia 1998;18:463-7.
40. Kroner-Herwig B, Mohn U, Pothmann R. Comparison of biofeedback and relaxation in the treatment of pediatric headache and the influence of parent involvement on outcome. Appl Psychophysiol Biofeedback 1998;23:143-57.
41. Blanchard EB, Applebaum KA, Radnitz CL, et al. Placebo-controlled evaluation of abbreviated progressive muscle relaxation and of relaxation combined with cognitive therapy in the treatment of tension headache. J. Consult Clin Psychol 1990;58:210-5.
42. Blanchard EB, Nicholson NL, Taylor AE, et al. The role of regular home practice in the relaxation treatment of tension headache. J Consult Clin Psychol 1991;59:467-70.
43. Larsson B, Melin L, Doberl A. Recurrent tension headache in adolescents treated with self-help relaxation training and a muscle relaxant drug. Headache 1990;30:665-71.
44. Holroyd, KA, Nash JM, Pingel JD, et al. A comparison of pharmacological (amitriptyline HCL) and nonpharmacological (cognitive-behavioral) therapies for chronic tension headaches. J Consult Clin Psychol 1991;59:387-93.
45. Melis PML, Rooimans W, Spierings ELH, Hoogduin CAL. Treatment of chronic tension-type headache with hypnotherapy: a single-blind time controlled study. Headache 1991;31:686-9.
46. Reich BA. Non-invasive treatment of vascular and muscle contraction headache: a comparative longitudinal clinical study. Headache 1989;29:34-41
47. Keller E, Bzdek VM. Effects of therapeutic touch on tension headache pain. Nurs Res 1986;35:101-6.
48. Launso L, Brendstrup E, Arnberg S. An exploratory study of reflexological treatment for headache. Altern Ther Health Med 1999;5:57-65.
49. Walach H. Classical homeopathic treatment of chronic headaches. Cephalalgia 1997;17:119-126.
50. Rasmussen BK. Migraine and tension-type headache in a general population: psychosocial factors. Int J Epidemiol 1992;21:1138-43.
51. Donias SH, Peioglou-Harmoussi S, Georgiadis G, Manos N. Differential emotional precipitation of migraine and tension-type headache attacks. Cephalalgia 1991;11:47-52.
52. Wittrock DA, Myers TC. The comparison of individuals with recurrent tension-type headache and headache-free controls in physiological response, appraisal, and coping with stressors: a review of the literature. Ann Behav Med 1998;20:118-34 [review].
53. Myers TC, Wittrock DA, Foreman GW. Appraisal of subjective stress in individuals with tension-type headache: the influence of baseline measures. J Behav Med 1998;21:469-84.
54. DeBenedittis G, Lorenzetti A, Pieri A. The role of stressful life events in the onset of chronic primary headache. Pain 1990;40:65-75.
55. DeBenedittis G, Lorenzetti A. The role of stressful life events in the persistence of primary headache: major events vs. daily hassles. Pain 1992;51:35-42.
56. Ficek SK, Wittrock DA. Subjective stress and coping in recurrent tension-type headache. Headache 1995;35:455-60.
57. Holroyd KA, Stensland M, Lipchik GL, et al. Psychosocial correlates and impact of chronic tension-type headaches. Headache 2000;40:3-16.
58. Serrano-Duenas M. Chronic tension-type headache and depression. Rev Neurol 2000;30:822-6 [in Spanish].
59. Hatch JP, Schoenfeld LS, Boutros NN,et al. Anger and hostility in tension-type headache. Headache 1991;31:302-4.
60. Rugh JD, Hatch JP, Moore PJ et al. The effects of psychological stress on electromyographic activity and negative affect in ambulatory tension-type headache patients. Headache 1990;30:216-9.
61. Hatch JP, Moore PJ, Borcherding S, et al. Electromyographic and affective responses of episodic tension-type headache patients and headache-free controls during stressful task performance. J Behav Med 1992;15:89-112.
62. Payne TJ, Stetson B, Stevens VM, et al. The impact of cigarette smoking on headache activity in headache patients. Headache 1991;31:329-32.