[1] Stanford Univ, Dept Bioengn, Stanford, CA 94305 USA
[2] Ernst Moritz Arndt Univ Greifswald, Res Ctr Pharmacol & Expt Therapeut, D-17487 Greifswald, Germany
[3] Marshfield Clin Res, Ctr Human Genet, Marshfield, WI 54449 USA
[4] Univ Chicago, Med Ctr, Chicago, IL 60637 USA
[5] Vanderbilt Univ, Sch Med, Nashville, TN 37232 USA