1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
2. Univ. of Pittsburgh, PA (United States)
3. Univ. of Pennsylvania, Philadelphia, PA (United States)
4. National Center for Biotechnology Information, Bethesda, MD (United States)
5. Univ. of Washington, Seattle, WA (United States)
6. Univ. of Edinburgh, Scotland (United Kingdom)
7. Northwestern Univ., Evanston, IL (United States)