comprise conditions in which fatigue is also a major complain such as suspected or diagnosed chronic and/or neurological diseases (e.g., parkinson's disease, amyotrophic lateral sclerosis, alzheimer's disease); pre-existing, chronic diseases affecting the musculoskeletal system (e.g., fibromyalgia).

comprise conditions in which fatigue is also a major complain such as suspected or diagnosed chronic and/or neurological diseases (e.g., parkinson's disease, amyotrophic lateral sclerosis, alzheimer's disease); pre-existing, chronic diseases affecting the musculoskeletal system (e.g., fibromyalgia).

- suspected or diagnosed chronic and/or neurological diseases; - pre-existing, chronic diseases affecting the musculoskeletal system

- suspected or diagnosed chronic and/or neurological diseases; - pre-existing, chronic diseases affecting the musculoskeletal system