1. Psychological trauma and functional somatic syndromes: A systematic review and meta-analysis;Afari;Psychosomatic Medicine,2014
2. American College of Rheumatology (2011). 2010 ACR Fibromyalgia Diagnostic Criteria (Modified 2011). Available at:http://www.townsendletter.com/Nov2013/FibromyalgiaDiagnosticCriteria.pdf. Accessed 11 July 2018.
3. A clinical trial of cranial electrotherapy stimulation for anxiety and comorbid depression;Barclay;Journal of Affective Disorders,2014
4. Functional somatic syndromes;Barksy;Annals of Internal Medicine,1999
5. The effect of cranial electrotherapy stimulation (CES) on pain associated with fibromyalgia;Cork;The Internet Journal of Anesthesiology,2003