[1] US DOE, Pacific NW Natl Lab, Computat Sci & Math Div, Computat Biol & Bioinformat Grp, Richland, WA 99352 USA
[2] Dartmouth Hitchcock Med Ctr, Lebanon, NH 03756 USA
[3] Battelle Seattle Res Ctr, Pacific NW Natl Lab, Seattle, WA 98109 USA
[4] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA
[5] Vanderbilt Univ, Sch Med, Mass Spectrometry Res Ctr, Nashville, TN 37232 USA