Table 2.

The list of interview questions for researchers.

Category	Questions
General information	What kinds of studies do you normally carry out? Will the participants need to be involved for a long term? What is the typical time commitment required from them?
Recruitment	What are the difficulties you face when recruiting participants for your research? What are the factors that lead to a successful recruitment? What information do you provide to recruit potential participants? How do you screen relevant or appropriate participants? How much time do you spend on recruitment? What incentives do you give to your participants? How much cost do you spend on marketing?
Channels	What channel do you currently use to recruit? How do you think that technologies can help to improve the participant recruitment and engagement in health research? Would you able to use materials such as images, photos, or videos to recruit participants? Why or why not? Have you considered using a consumer register or a potential participant database for recruitment?