Evidence for linkage of bipolar disorder to chromosome 18 with a parent-of-origin effect

O. Colin Stine, Jianfeng Xu, Rebecca Koskela, Francis J. McMahon, Michele Gschwend, Carl Friddle, Chris D. Clark, Melvin G. Mclnnis, Sylvia G. Simpson, Theresa S. Breschel, Eva Vishio, Kelly Riskin, Harriet Feilotter, Eugene Chen, Susan Shen, Susan Folstein, Deborah A. Meyers, David Botstein, Thomas G. Marr, J. Raymond DePaulo