In the version of this Article initially published, the author list and affiliations were incomplete. Karl Heilbron and Adam Auton, both with 23andMe, Inc., have been added to the author list. Further, the location for the 23andMe Research Team, now reading “Sunnyvale, CA” initially appeared as Mountain View, CA. The changes have been made to the online version of the paper. *A list of authors and their affiliations appears online.