The debate over a link between autism and vaccines continues. A study published earlier this month concluded African-American boys are more at risk for autism if they're given the measles, mumps and rubella vaccine before the age of 2. The study author says researchers at the [CDC] knew about the link in 2004 -- and covered it up. CDC researchers are standing by their original findings: that there is no link between autism and vaccination schedules. The new study was funded by the Focus Autism Foundation, which says it is dedicated to exposing the causes of autism, focusing on the role of vaccinations." The study has since been removed from the public domain pending further investigation, according to Translational Neurodegeneration. In an online statement, the scientific journal said the paper had been removed "because of serious concerns about the validity of its conclusions." Brian Hooker, author of the study and a biochemical engineer, found African-American boys who were given the MMR vaccine before age 24 months were more likely to be diagnosed with autism. Hooker said he analyzed the same set of data that was the basis for a 2004 study done by researchers at the [CDC]. Hooker said he began his research after he was contacted by one of the original study authors, William Thompson, in November 2013. Thompson is a senior scientist with the CDC, where he has worked since 1998. Hooker said he believes the increased risk for African-American boys he found was not identified in the CDC study because, by excluding children without birth certificates, the CDC study results were skewed.