Phase one: Questionnaire development
A structured questionnaire with predefined domains of interest was
constructed based on an extensive review of the items included
previously in published adherence questionnaires (21). The most commonly
used items published in adherence questionnaires were included in the
first draft of the (AAMQ). Other items that seem important to assess
adherence were added after being agreed upon by the research team. The
finalized items for the first draft (AAMQ-V1) were reviewed by the
research team in order to combine concepts and to remove duplicates or
irrelevant items (22).