1. Public Health Resource Unit. Critical appraisal skills programme (CASP) making sense of evidence: 10 questions to help you make sense of randomised controlled trials [online] Oxford: Public Health Resource Unit. Available from: http://www.phru.nhs.uk/Doc_Links/rct%20appraisal%20tool.pdf; 2006 [accessed 17.01.09].
2. Availability and use of electrotherapy devices: a survey;Shah;International Journal of Therapy and Rehabilitation,2007
3. Ultrasound usage and dosage in sports physiotherapy;Warden;Ultrasound in Medicine and Biology,2002
4. A survey of electrotherapeutic modalities: ownership and use in the NHS in England;Pope;Physiotherapy,1995
5. Physical therapy;Turner,2005