Data are collected using the REDCap web application (https://redcap.zhaw.ch/). REDCap is designed for the creation and administration of online surveys. Respondents can access the survey directly via a QR code or link and complete the screening questionnaire via smartphone or computer. In a first step, the participating persons are included or excluded based on the criteria mentioned (chapter: Proband:innen). Once eligibility has been confirmed, the HSQ is completed online for the first time in a second step. After that, the test persons will receive a reminder e-mail after 2 weeks to complete the retest online. After the reminder email the test persons have 2 weeks to complete the retest. Those who participate later will be excluded and not included in the data analysis. In addition, the retest asks whether the headaches have changed compared to the test due to the physiotherapeutic treatment. This is asked with a three Likert scale (not changed, slightly changed, strongly changed). The severely changed headaches are not included in the analysis.
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