The Duke Center for Human Genetics, Duke University Medical Center, Durham, NC 27710, USA.|The Duke Center for Human Genetics, Duke University Medical Center, Durham, NC 27710, USA.|The Duke Center for Human Genetics, Duke University Medical Center, Durham, NC 27710, USA.|The Duke Center for Human Genetics, Duke University Medical Center, Durham, NC 27710, USA.|The Duke Center for Human Genetics, Duke University Medical Center, Durham, NC 27710, USA.|The Duke Center for Human Genetics, Duke University Medical Center, Durham, NC 27710, USA.|The Duke Center for Human Genetics, Duke University Medical Center, Durham, NC 27710, USA.|The Duke Center for Human Genetics, Duke University Medical Center, Durham, NC 27710, USA.