Table 1 Procedure of the study for participants per day
| Day 1 |
| Fill out online survey 1 (15 min) |
| Install application and look at demo-questions |
| Day 2 until 8 |
| Fill out questions application after signal on smartphone (2 min × 10 per day) |
| Day 9 |
| Fill out online survey 2 (2 min) |