| http://www.w3.org/ns/prov#value | - Fatigue is a complex, nonspecific symptom involving multiple biological components (e.g., central mechanisms, cellular mechanisms, neuroendocrine factors, and muscle properties) whose underlying mechanism is not yet clearly and fully defined.1,2 Fatigue is likely to be produced by a number of factors, including stress, medical conditions, and medications, as well as environmental factors, such as
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