Trevor Schaefer, youth ambassador and founder of Trevor's Trek Foundation, testifies during a hearing on "Disease Clusters and Environmental Health."
Trevor Schaefer, youth ambassador and founder of Trevor's Trek Foundation, testifies during a hearing on "Disease Clusters and Environmental Health." Pete Marovich/MCT
Trevor Schaefer, youth ambassador and founder of Trevor's Trek Foundation, testifies during a hearing on "Disease Clusters and Environmental Health." Pete Marovich/MCT

Congress urged to track cancer clusters better

March 29, 2011 4:27 PM