http://www.prnewswire.com/news-releases/eneura-inc-receives-fda-clearance-for-springtms-migraine-treatment-device-260398971.html
http://www.eneura.com/
https://www.accessdata.fda.gov/cdrh_docs/pdf13/K130556.pdf
http://www.sciencedirect.com/science/article/pii/S1474442210700545