Table 1. Comparative summaries of previous studies.

Studies Brief description
[6] Digital probes kit using questionnaires and pictures
[7] Digital diary using geo-tagged multimedia
[8] Digital diary exploring the life-logging concept
[9] Mobile app for visual research using photographs
[10] Digital crowdsourcing in the clinical trials context
[11] Key themes and challenges in patient-generated images
[12] Exploration in citizen science for data collection/analysis
[13] Using embedded smartphone sensors for data collection
[14] Outlining requirements for local civic participation tools