?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Visscher&rft.au=Visscher%2C+PM&rft.aufirst=PM&rft.atitle=Assumption-free+estimation+of+heritability+from+genome-wide+identity-by-descent+sharing+between+full+siblings.&rft.volume=2&rft.date=24+March+2006&rft.issn=1553-7404&rft.title=PLoS+Genetics&rft.issue=3&rft.genre=article