Has anyone read The Great Nerve: The New Science of the Vagus Nerve and How to Harness Its Healing Reflexes by Dr. Kevin Stacey? It is written by a pioneer in our understanding of the vagus nerve and in its therapeutic stimulation (through electrical stimulation). Chapter 7 focuses on ultrasound therapies. I found the book very informative. Seems very complementary and validating to the information provided in this Skool.