1. Mendizabal JE, Umana E, Zweifler R. Cluster Headache: Horton's Cephalalgia Revisited. South Med J 1998;91:606-17 [review].
2. Sicuteri F, Renzi D, Geppetti P. Substance P and enkephalins: a creditable tandem in the pathophysiology of cluster headache and migraine. Adv Exp Med Biol 1986;198B:145-52.
3. Sicuteri F, Fanciullacci M, Nicolodi M, et al. Substance P theory: a unique focus on the painful and painless phenomena of cluster headache. Headache 1990;30:69-79 [review].
4. Lynn B. Capsaicin. Actions on nociceptive C-fibers and therapeutic potential. Pain 1990;41:61-9.
5. Sicuteri F, Fusco BM, Marabini S, et al. Beneficial effect of capsaicin application to the nasal mucosa in cluster headache. Clin J Pain 1989;5:49-53.
6. Fusco BM, Marabini S, Maggi C, et al. Preventative effect of repeated nasal applications of capsaicin in cluster headache. Pain 1994;59:321-5.
7. Fusco BM, Fiore G, Gallo F, et al. “Capsaicin-sensitive” sensory neurons in cluster headache: pathophysiological aspects and therapeutic indication. Headache 1994;34:132-7.
8. Marks DR, Papoport A, Padla D, et al. A double-blind placebo-controlled trial of intranasal capsaicin for cluster headache. Cephalalgia 1993;13:114-6.
9. Chazot G, Claustrat B, Brun J, et al. A chronobiological study of melatonin, cortisol, growth hormone, and prolactin secretion in cluster headache. Cephalalgia 1984;4:213-20.
10. Waldenlind E, Gustafsson SA, Ekbom KA, Wetterberg L. Circadian secretion of cortisol and melatonin during active cluster periods and remission. J Neurol Neurosurg Psychiatry 1987;50:207-13.
11. Leone M, Lucini V, D'Amico D, et al. Twenty-four-hour melatonin and cortisol plasma levels in relation to timing of cluster headache. Cephalalgia 1995;15:224-9.
12. Leone M, Lucini V, D'Amico D, et al. Abnormal 24-hour urinary excretory pattern of 6-sulphatoxymelatonin in both phases of cluster headache. Cephalalgia 1998;18:664-7.
13. Leone M, D'Amico D, Moschiano F, et al. Melatonin versus placebo in the prophylaxis of cluster headache: a double-blind pilot study with parallel groups. Cephalalgia 1996;16:494-6.
14. Peres MFP, Rozen TD. Melatonin in the preventive treatment of chronic cluster headache. Cephalalgia 2001;21:993-5.
15. Mauskop A, Altura BT, Cracco RQ, Altura BM. Intravenous magnesium sulfate relieves cluster headaches in patients with low serum ionized magnesium levels. Headache 1995;35:597-600.
16. Mauskop A, Altura BT, Cracco RQ, Altura BM. Intravenous magnesium sulfate rapidly alleviates headaches of various types. Headache 1996;36:154-60.
17. Fogan L. Treatment of cluster headache. A double-blind comparison of oxygen v air inhalation. Arch Neurol 1985;43:362-3.
18. Kudrow L. Response of cluster headache attacks to oxygen inhalation. Headache 1981;21:1-4.
19. Mendizabal JE, Umana E, Zweifler R. Cluster Headache: Horton's Cephalalgia Revisited. South Med J 1998;91:606-17 [review].
20. DiSabato F, Fusco BM, Pelaia P, Giacovazzo M. Hyperbaric oxygen therapy in cluster headache. Pain 1993;52:243-5.
21. DiSabato F, Giacovazzo M, Cristalli G, et al. Effect of hyperbaric oxygen on the immunoreactivity to substance P in the nasal mucosa of cluster headache patients. Headache 1996;36:221-3.
22. Pascual J, Peralta G, Sanchez U. Preventive effects of hyperbaric oxygen in cluster headache. Headache 1995;35:260-1.
23. DiSabato F, Rocco M, Martelletti P, Giacovazzo M. Hyperbaric oxygen in chronic cluster headaches: influence on serotonergic pathways. Undersea Hyperb Med 1997;24:117-22.
24. Mendizabal JE, Umana E, Zweifler R. Cluster Headache: Horton's Cephalalgia Revisited. South Med J 1998;91:606-17 [review].
25. Trotsky MB. Neurogenic vascular headaches, food and chemical triggers. Ear Nose Throat J 1994;73:228-30.
26. Levi R, Edman GV, Ekbom K, Waldenlind E. Episodic cluster headache. II: High tobacco and alcohol consumption in males. Headache 1992;32:184-7.
27. Manzoni GC. Cluster headache and lifestyle: remarks on a population of 374 male patients. Cephalalgia 1999;19:88-94.
28. Manzoni GC. Cluster headache and lifestyle: remarks on a population of 374 male patients. Cephalalgia 1999;19:88-94.
29. Levi R, Edman GV, Ekbom K, Waldenlind E. Episodic cluster headache. II: High tobacco and alcohol consumption in males. Headache 1992;32:184-7.
30. Hannerz J. Symptoms and diseases and smoking habits in female episodic cluster headache and migraine patients. Cephalalgia 1997;17:499-500.
31. Anonymous. Case-control study on the epidemiology of cluster headache. I: Etiological factors and associated conditions. Italian Cooperative study Group on the Epidemiology of Cluster Headache (ICECH). Neuroepidemiology 1995;14:123-7.
32. Swanson JW, Yanagihara T, Stang PE, et al. Incidence of cluster headaches: a population-based study in Olmsted County, Minnesota. Neurology 1994;44:433-7.