In this study, the patients in the experimental group will be followed up with the COVOS app and nursing interventions (videos, information messages) to manage their symptoms will be directed with the COVOS app.

Physical symptom status will be assessed using the Omaha System Problem Rating Scale for Outcomes. The Problem Rating Scale for Outcomes is a method to evaluate patient progress throughout the period of service. It consists of three five-point, Likert-type scales to measure the entire range of severity for the concepts of Knowledge, Behavior, and Status.

Psychosocial symptom status will be evaluated with Depression Anxiety Stress Scale- 21 (DASS-21). DASS-21 is a set of three self-report scales designed to measure the emotional states of depression, anxiety and stress. Each of the three DASS-21 scales contains 7 items, divided into subscales with similar content. For depression the cutoff scores are: Normal: 0-9, Mild: 10-12, Moderate:13-20, Severe: 21-27, and Extremely severe: 28-42.

For anxiety the cutoff scores are: Normal: 0-6, Mild: 7-9, Moderate: 10-14, Severe:15-19, and Extremely severe: 20-42. For stress the cutoff scores are: Normal: 0-10, Mild:11-18, Moderate:19-26, Severe: 27-34, and Extremely severe: 35-42.

Cognitive symptom status will be assessed using the Omaha System Problem Rating Scale for Outcomes. The Problem Rating Scale for Outcomes is a method to evaluate patient progress throughout the period of service. It consists of three five-point, Likert-type scales to measure the entire range of severity for the concepts of Knowledge, Behavior, and Status.

Quality of life will be evaluated with the SF-12. The SF-12 is a self-reported outcome measure assessing the impact of health on an individual's everyday life. It is often used as a quality of life measure.

The SF-12 is a shortened version of it's predecessor, the SF-36, which itself evolved from the Medical Outcomes Study. The SF-12 was created to reduce the burden of response.

The SF-12 uses the same eight domains as the SF-36:

Limitations in physical activities because of health problems. Limitations in social activities because of physical or emotional problems Limitations in usual role activities because of physical health problems Bodily pain General mental health (psychological distress and well-being) Limitations in usual role activities because of emotional problems Vitality (energy and fatigue) General health perceptions