Fatigue was assessed by the Fatigue Severity Scale (FSS). This is a 9-item questionnaire that assesses the effect of fatigue on daily living. Each item is a statement on fatigue that the subject rates from 1 "completely disagree" to 7 "completely agree". A score of 4 or higher generally indicates severe fatigue

Physical activity levels were assessed by the International Physical Activity Questionnaire (IPAQ): short form. The online self-reporting questionnaire consisted of questions investigating the respondents' PA practice in terms of frequencies and durations of sitting, walking, moderate-intensity physical activities and vigorous-intensity physical activities. The MET-minutes per week (MET-min/week) were calculated using the following formula: intensity (MET) x duration x frequency. Physical activity levels were classified as physically inactive (<600 MET-min/week), with low levels of physical activity (600-3000 MET- min/week) and physical activity level that is sufficient (> 3000 MET-min/week)

The Pittsburgh Sleep Quality Index (PSQI) questionnaire was used to measure sleep quality using an 18-item scale containing seven items that included sleep quality, sleep duration, sleep latency, habitual sleep efficiency, sleep disturbance, use of sleeping medications, and daytime dysfunction. Each dimension scored between 0-3, with a total score ranging from 0-21, and a higher score indicating lower sleep quality.

The Hospital Anxiety and Depression Scale (HADS) was composed by two subscales (i.e., anxiety and depression), with 7-items each. The anxiety part of HADS was used to evaluate the anxiety levels of the patients. Each dimension scored between 0-3, with a total score ranging from 0-21, and a higher score indicating higher anxiety level.