Potential participants self-identify themselves to study personnel by contacting the PI via office phone or IU email. Potential participants were informed of the research study through word-of-mouth and fliers at pain and prosthetic clinics and amputee support groups in the Indianapolis area which will invite interested individuals to contact the PI for more information and a telephone screening for eligibility. If an interested individual screens eligible and is interested after hearing more about the study, an appointment for an Informed Consent Visit will be made.