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Thierry Hertoghe, M.D., is a member of the International Advisory Board of the American Academy of Anti-Aging Medicine. He lectures regularly to medical professionals and laypeople in the United States and abroad on the subject of hormone deficiencies. Jules-Jacques Nabet, M.D., practices general medicine in Paris and London, specializing in longevity. He is a member of the European Academy of Quality of Life and Longevity Medicine (EQUALL) and the American Academy of Anti-Aging Medicine. From the Hardcover edition.