Open questionnaire vs. structured questionnaire in the identification of trigger factors in migraine and tension-type headache

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Publication date
1 January 2009
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-Springer-Verlag Italia -Masson SPA:via Flli Bressan 2, I 20126 Milan Italy:011 39 02 27074286, EMAIL: [email protected], INTERNET: http://www.masson.it, Fax: 011 39 02 27074210

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