<https://www.alpha-stim.com/wp-content/uploads/2018/09/Trade-in-program.png>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.alpha-stim.com/blog/not-satisfied-with-your-current-ces-device-trade-it-in-for-alpha-stim/>