Data collection and handling
Data were stored at the secure server for sensitive data in Region H. After informed consent, the clinical project group collected data on lifestyle behaviours and changes via interviews, the apps, and the dashboard. Data on the date and type of surgery were collected from the medical records. The IT companies extracted data on the duration of app use, the number of visits, and the opening and completion of games/chares.The data handling conformed to the GDPR agreement. There was no contact between IT companies and patients. The project staff had contact with each IT company and did not share any personally identifiable information. Only the clinical project group had access to personally identifiable data.Due to the cloud storage of data, there was no personally identifiable information in the apps or the dashboard, and the IT companies had no access to personally identifiable data. Anonymous pre-paid cards or smartphones were handed out. Only a random number or nickname was used in the app and dashboard, thereby making it visible to the IT companies.