References
1、Mayo clinic: Tension headache
2、Medscape: Tension headache
3、Uptodate: Patient education: Headache treatment in adults (Beyond the Basics)
4、Uptodate: Tension-type headache in adults: Pathophysiology, clinical features, and diagnosis
5、Uptodate: Tension-type headache in adults: Acute treatment
6、Uptodate: Tension-type headache in adults: Preventive treatment
7、Uptodate: Characteristics of common headache syndromes
8、Gary D. Carr. Alcoholism: A Modern Look at an Ancient Illness. Primary care : clinics in office practice. Volume 38, Issue 1, March 2011, Pages 9-21.
9、Bertil B. Fredholm, Karl Bättig et al. Actions of Caffeine in the Brain with Special Reference to Factors That Contribute to Its Widespread Use. Pharmacological Reviews March 1999, 51 (1) 83-133
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