Chapter 47 from "Bioelectromagnetic and Subtle Energy Medicine", 2nd Edition, Ed Paul Rosch, CRC Press. The whole book can be obtained from: https://www.crcpress.com/Bioelectromagnetic-and-Subtle-Energy-Medicine-Second-Edition/Rosch/p/book/9781482233193 
CRC Press © 2015, chapter 47 by Andrew Tresidder and Michael Bevington and from the book entitled Bioelectromagnetic and Subtle Energy Medicine, Second EditionReproduced with the permission of Taylor & Francis Group, LLC, a division of Informa plc and exclusive distributor of this CRC Press title.