1 2 3 "functional disorder", Physicians' Desk Reference, 2006, a disease characterized by physical symptoms with no known or detectable organic basis. See behavior d., neurosis. SYN: functional disease, functional illness.
"functional disroder", WordNet 2.0, มหาวิทยาลัยพรินซ์ตัน, 2003, disorder showing symptoms for which no physiological or anatomical cause can be identified
↑ Natelson, Benjamin H. (1998). Facing and fighting fatigue: a practical approach. New Haven, Conn: Yale University Press. p. 33. ISBN0-300-07401-8.
