Rav IvkerDr. Rav Ivker is a holistic family doctor with nearly five decades of experience treating more than 70,000 patients. He's written seven holistic healing books, most notably Sinus Survival: The Holistic Medical Treatment for Sinusitis, Allegies, and Colds (Tarcher/Penguin). He is a board-certified holistic physician (ABIHM) and a Fellow of the American Academy of Family Physicians and runs his own holistic medical practice in Boulder, Colorado. Read More Read Less