From: Fair Warning
"In December, a branch of the CDC called the Agency for Toxic Substances and Disease Registry asked for more time to collect additional data and samples. The agencies already have missed at least two target deadlines – one in 2016 and another in 2017 – to produce research results, FairWarning has found. For reasons that are unclear, the agencies have been unwilling to make anyone available to discuss details and progress of the research, despite multiple interview requests by FairWarning to all three agencies."