1. www.usp.org, August 2015.
2. www.fda.gov, http://www.fda.gov/MedicalDevices/DeviceRegulationandGuidance/Overview/ClassifyYourDevice/ucm051512.htm.
3. www.who.int, August 2015.
4. http://www.fda.gov/MedicalDevices/DeviceRegulationandGuidance/Overview/ClassifyYourDevice/ucm051530.htm, August 2015.
5. Classification of Medical Device, European Commission DG, Health and Consumer Directorate B, Unit B2 “Cosmetics and Medical Devices”;Medical Devices Guidance Document,2010