## 3 Results  
### Digital Health--Telemedicine and Personal Digital Health  
Telemedicine can provide a medium to facilitate the connection between patient and doctor. For example, cancer screening is possible for patients suffering from potentially malignant skin lesions. Teledermatology, for instance, is more efficient than face-to-face interaction when considering time, as patients can be seen on short notice. Although more convenient for both parties, diagnostic accuracy can be lower in this case, as the lesion is seen in a picture or, in the best-case scenario, in a high-quality video. The precision of the diagnostic remains to be improved [15]. Breast cancer is another pathology which can be assessed virtually. Not only screening but also follow-up/surveillance was feasible with the help of telemedicine. A small percentage of patients needed an in-person evaluation when an in-detail physical exam was required. Most cases had benefited from online consultation, thus reducing time-consuming and unnecessary appointments [16]. An essential goal of the medical community is to make telemedicine more attractive for the elders, especially oncological patients. In several studies regarding telecology, it has been shown that the majority of people above 65 years who accessed telemedical  
Figure 1: Selection algorithm. resources during the COVID-19 pandemic came back very quickly to the traditional ways, such as in-person appointments. Although more affordable, convenient, and accessible, as declared by the patients in several surveys, this approach was not sufficient to withstand the familiarity of the classical medical exam; thus, after the pandemic, many patients returned to personal interactions with the doctor [17] (Figure 2). Digital biomarkers offer the possibility of measuring biological responses to diverse changes in external factors such as stress and diet over a more extended period of time, with the advantage of highlighting subtle alterations in the normal biological equilibrium. These novel biomarkers are called resilience biomarkers and can be established by digital biomarkers. They can detect early signs of disbalances in the normal regulatory processes and characterise the spectrum of healthy and unhealthy. Personal digital health is an innovative way of using different wearables, mobile phones, and applications to track one's health in a continuous, non-invasive, and social context. A few of the health indicators that digital tools can assess are heart rate, oxygen saturation, sleep pattern, and skin temperature. Monitoring health status may give insights into the body's ability to be resilient in the face of daily stressors, diet, and exercise, as well as resilience that diminishes with age and disease when compensatory mechanisms are impaired. Conventional health assessment instruments such as blood sample analysis, imaging, and doctor's appointments are not meant to evaluate health status continuously and non-invasively; they only offer a view of one's health in an episodic time frame [4]. The oncological field may benefit from the impact wearable devices have on reporting symptoms and vital parameters in an objective approach that may increase the quality of life in the long run. The use of wearables in reporting medical status has advantages: the ability to track symptoms passively, continuously, and remotely and communicate with medical professionals through apps, relatively low costs, daily medication reminders, and community support [18]. Wearables monitor three main parameters and can help patients and physicians track symptoms and adverse effects: physical activity, sleep, and heart rate. Physical activity is one of the health metrics that can shed light on the severity of future chemotherapy side effects and overall well-being (both emotional and physical) [18; 19; 20]. It can be measured as steps or calories per day or hour. Different apps use this metric to generate graphs that keep up with patients' evolution and reactions after medication  
Figure 2: Telemedicine in cancer care.