Medical News Today, June 14, 2008 Almost 70 percent of parents who refuse to vaccinate their children do so because they believe vaccines may cause harm. To respond to these concerns about vaccine safety, the National Network for Immunization Information writing team of Dr. Martin G. Myers and Diego Pineda, both of UTMB, have written a book titled, "Do Vaccines Cause That?! A Guide for Evaluating Vaccine Safety Concerns."