So, if you question it's existence: http://www.epglmed.com/EPGL_Medical_Sciences/Research_files/EPGL%20-2-%20A%20New%20Muscle%20Pain%20Detection%20Device%20%281%29.pdf http://www.painmed.org/search.aspx?f=80&s=Mpdd http://www.healingwell.com/community/default.aspx?f=16&m=2470384 http://www.cbsnews.com/video/watch/?id=5413490n http://www.youtube.com/watch?v=NPQ3f-Uy_Gc&feature=youtube_gdata_player http://www.normanmarcuspaininstitute.com/uncategorized/your-bulging-disc-doesnt-hurt http://www.normanmarcuspaininstitute.com/back-pain/your-pain-may-have-more-than-one-source#more-321