The National Toxicology Program (NTP) on Wednesday released a draft report linking prenatal and childhood fluoride exposure to reduced IQ in children, after public health officials tried for almost a year to block its publication.

The U.S. Department of Health and Human Services (HHS) and the Centers for Disease Control and Prevention (CDC) initially blocked the NTP from releasing the report, according to emails obtained via a Freedom of Information Act (FOIA) request.

But a court order stemming from a lawsuit filed by Food and Water Watch against the U.S. Environmental Protection Agency (EPA) forced the report’s release this week.

The NTP, an interagency program run by HHS that researches and reports on environmental toxins, conducted a six-year systematic review to assess scientific studies on fluoride exposure and potential neurodevelopmental and cognitive health effects in humans.

The report, containing a monograph and a meta-analysis, went through two rounds of peer review by the National Academies of Sciences, Engineering, and Medicine. Comments from reviewers and HHS and NTP’s responses also were included in the report released Wednesday.