Corrigendum: Impairment in episodic and chronic cluster headache

In (1) the published version of Figures 1 and 2 appeared with the figure captions transposed.

The figures and correct captions are reproduced below:

Figure 1.

Mean total scores of different patient groups in the Headache Disability Inventory (HDI). Whiskers represent standard error of the mean. CCH, chronic cluster headache; ECHa, episodic cluster headache in the active phase; ECHi, episodic cluster headache outside the active period; MIG; migraine; Control, healthy controls.

Figure 2.

Results of Student–Newman–Keuls (SNK) post hoc tests for variables : TOTAL, FUNCTION, EMOTION. Data was grouped into homogeneous subgroups that differ from each other with P < 0.05. Within subgroups no significant differences could be found. CCH, chronic cluster headache; ECHa, episodic cluster headache in the active phase; ECHi, episodic cluster headache outside the active period; MIG; migraine; Control, healthy controls.