article_snippet: The study involved nearly six million children born from 1997 to 2007.
article_snippet: The team, led by Peter Bearman, a professor of social sciences at Columbia University in New York City, collected data on 5.9 million California births, including 48,865 infants conceived through assisted reproduction, and 32,922 children with autism.
article_snippet: Professor Bearman said this was the largest study looking at this relationship that has ever been carried out.
article_snippet: The research was published online in the American Journal of Public Health.