This book is part of a book series called Usa Today Health Reports-Diseases And Disorders .

This book has been graded for interest at 11-18 years.

There are 128 pages in this book. This book was published 2011 by Twenty-First Century Books (Tm) .

Ana Maria Rodriguez, Ph. D. , was a research scientist in the biological and medical sciences for more than 20 years. She is currently a full-time writer with more than 65 magazine articles and three children's books to her credit.