Here's the link:
http://www.drkertz.com/buy_book.html
I met Dr. Kertz at NAMM '08 and I am very impressed. He is a bass player, a chiropractor and an acupuncturist.
I am currently reading the book and will comment further when I finish it, but I wanted to waste no time in getting this on the forum. There is information here that is crucial to a long life as a bass player and if we all internalize it and are as dedicated to good health as we are to good tone and landing on the top of the beat, it will be a better world!
Kindly,
Lee