Rounding Behavior in the Reporting of Headache Frequency Complicates Headache Chronification Research.
Houle, Timothy T.; Turner, Dana P.; Houle, Thomas A.; Smitherman, Todd A.; Martin, Vincent; Penzien, Donald B.; Lipton, Richard B.; Headache: The Journal of Head & Face Pain, 2013, vol. 53, issue 6, p 908, ISSN 00178748. ISBN 15264610.

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