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Rounding behavior in the reporting of headache frequency complicates headache chronification research.

Houle TT, Turner DP, Houle TA, Smitherman TA, Martin V, Penzien DB, Lipton RB. Rounding behavior in the reporting of headache frequency complicates headache chronification research. Headache. 2013 Jun; 53(6):908-19.

View in: PubMed