Chronic fatigue is common, is difficult to measure, can be associated with considerable morbidity, and is rarely a subject of controversy. It is probably the most common symptom of illness affecting sufferers of both acute and chronic conditions. However, a growing interest in the health problem presented by fatigue both in clinical practice and research, coupled with a decreasing number of reported studies on fatigue in the last decade, make an updated and systemic review of factors related to fatigue necessary. Therefore the aim of this study was undertaken to investigate correlates of...