1. Analytical Research and Development, Merck & Co., Inc., 126 E. Lincoln Avenue, Rahway, New Jersey 07065, United States
2. Infectious Diseases and Vaccines Discovery, Merck & Co., Inc., West Point, Pennsylvania 19486, United States
3. Departments of Chemistry and Molecular Biosciences, The Chemistry of Life Processes Institute, The Proteomics Center of Excellence at Northwestern University, Evanston, Illinois 60208, United States