1. Rosetta Inpharmatics LLC, 12040 115th Avenue N.E., Kirkland, WA 98034, U.S.A.
2. Department of Biostatistics, University of Washington, Seattle, WA 98195, U.S.A.
3. Merck Research Laboratories, W42-213 Sumneytown Pike, POB 4, Westpoint, PA 19846, U.S.A.