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. Author manuscript; available in PMC: 2016 Jan 31.
Published in final edited form as: Clin J Pain. 2015 Feb;31(2):159–168. doi: 10.1097/AJP.0000000000000091

Figure 1.

Figure 1

Study timeline for the 14 week clinical trial depicting the four week baseline, two 3-week treatment phases, the four week run-out, and time points for outcome measure assessments. Key: HA – headache; PPT – pressure-pain threshold; QoL – quality of life; PCC- perceived clinical change.