1. Department of Anatomy and
2. Department of Medical Genetics, Ullevål University Hospital and Faculty of Medicine, University of Oslo, Boks 1072 Blindern, NO-0316 Oslo, Norway
3. Present address: Department of Surgery, Huntsman Cancer Institute, University of Utah, 2000 Circle of Hope, Salt Lake City, UT 84112, USA
4. Solamere Technology Group, 1427 Perry Avenue, Salt Lake City, UT 84103, USA
5. Department of Pathology, University of California, San Francisco, 513 Parnassus Avenue, San Francisco, CA 94143, USA