1. Methodological aspects of prophylactic drug trials in migraine;Olesen;Cephalalgia,1981
2. Diagnostic lessons from the spectrum study;Lipton;Neurology,2002
3. The international classification of headache disorders, 2nd edition;Headache Classification Subcommittee of The International Headache Society;Cephalalgia,2004
4. Muscle contraction headache;Diamond,1986
5. Differences in cervical musculoskeletal impairment between episodic and chronic tension-type headache;Sohn;Cephalalgia,2010