However, participants rated the helpfulness and credibility of an intervention as most important, alongside with the ability of an intervention to motivate and the ability to access it without waiting time.
But this would be a pity, especially if it encourages us to dismiss the political and moral credibility of humanitarian intervention.
The appraisal to assess scalability was based on seven criteria, including credibility of the intervention, relevance to population demand, and easy transferability.
We acknowledge the fact that waiting list controls may be useful to ascertain the extent of placebo effects of the acupuncture setting (for example, contact factors, talking and listening, and credibility of the intervention), patient preferences and expectation.
Participants' perceptions of the credibility of the interventions will be determined by questions administered to all participants at the 6-month follow-up.
To evaluate the credibility of both interventions, the Treatment Credibility Scale [ 12] will be administered by the therapists to participants after the first and last physiotherapy treatment sessions.
Detailed descriptions of these variables follow: * International Classification of Headache Disorders, defined by expert members of the International Headache Society † Based on a measure developed by Borkovec and Nau to measure credibility of psychological interventions [38,39].
Acceptability and credibility of the interventions will be evaluated using a telephone follow-up at 2 weeks from the beginning of treatment and a questionnaire administered at 6 weeks [ 60].
