Participants
pain, psychiatric, migraine, substance abuse, diabetes
MIGRAINE, NEUROLOGICAL DISEASE, DIABETES
During the time from July 2020 to January 2021, we recruited 28 healthy volunteers, older than 18 years. Subjects with relevant medical conditions (e.g., diabetes, migraine, pacemaker, psychiatric or neurological diseases), recent use of local anesthetics, topical capsaicin, anticonvulsants or antidepressants, as well as subjects with substance abuse or current pain were excluded.