1. Bioinformatics Program, University of Michigan, Ann Arbor, MI 48109.
2. Departments of EECS and Statistics, University of Michigan, Ann Arbor, MI 48109.
3. Center for Statistical Genetics and Department of Biostatistics, University of Michigan, Ann Arbor, MI 48109.
4. Departments of Ophthalmology, Visual Sciences and Human Genetics, University of Michigan, Ann Arbor, MI 48109.