"A series of landmark and peer-reviewed studies by the IRC and some of the world’s leading epidemiologists conclude that an estimated 5.4 million people died from conflict-related causes in Congo since 1998. The vast majority were not killed in combat. Most tragically died from malaria, diarrhea, pneumonia and malnutrition--easily preventable and treatable conditions when people have access to health care and nutritious food.”
From: http://www.rescue.org/special-reports/congo-forgotten-crisis <http://www.rescue.org/special-reports/congo-forgotten-crisis>
There are additional details at the link - mainly links to press releases and reports dating back to the year 2000, unfortunately not in a format that will be very friendly for you I think.