Further evidence for a parent-of-origin effect at the NOP9 locus on language-related phenotypes

Kerry Andrea Pettigrew, Emily Frinton, Ron Nudel, May T. M. Chan, Paul Thompson, Marianna E. Hayiou-Thomas, Joel B. Talcott, John Stein, Anthony P. Monaco, Charles Hulme, Margaret J. Snowling, Diane F. Newbury, Silvia Paracchini