1. deCODE genetics, Sturlugata 8, IS-101 Reykjavik, Iceland.
2. Landspitali University Hospital, Reykjavik, Iceland.
3. Emory University School of Medicine, Atlanta, GA 30322, USA.
4. University of Pennsylvania School of Medicine, Philadelphia, PA 19104, USA.
5. Duke University School of Medicine, Durham, NC 27710, USA.