Chronic fatigue syndrome is the name currently used by the majority of the medical and scientific community to describe a condition or set of conditions characterized by fatigue and other symptoms. The term is contested, mostly by patients and patient advocacy groups, but also by some doctors. Several of the more common alternative names used to describe what most believe to be the same condition or subtypes include myalgic encephalomyelitis, chronic fatigue immune dysfunction syndrome, and post-viral fatigue syndrome . In 1959, E.D. Acheson an early investigator of benign myalgic encephalomyelitis, wrote: "The wisdom of naming a disorder, the nature of which cannot at present be proved, and which may be due to more than one agent, is debatable." The name used to label the conditions is one of several controversies related to CFS