| Study | Reason for exclusion |
|---|---|
| de Souza Carvalho 2012 | Mixed headaches. Data not available separately for 17 participants with tension headache |
| Diener 2005 | Mixed tension (16%) and migraine (84%) headaches. Data not reported separately |
| NCT01552798 | Study terminated with only 9 participants enrolled. No results |
| Wójcicki 1977 | "Common idiopathic headache". Not clearly randomised |
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