1. Department of Chemistry, University of Wisconsin−Madison, 1101 University Ave. Madison, Wisconsin 53706, United States
2. Department of Cell and Regenerative Biology, University of Wisconsin−Madison, 1111 Highland Ave., Madison, Wisconsin 53705, United States
3. Human Proteomics Program, School of Medicine and Public Health, University of Wisconsin−Madison, 1111 Highland Ave., Madison, Wisconsin 53705, United States
4. Analytical R&D, AbbVie Inc., 1 Waukegan Rd., North Chicago, Illinois 60064, United States