1. Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, District of Columbia 20057, United States
2. Clinical and Translational Glycoscience Research Center, Georgetown University, Washington, District of Columbia 20057, United States
3. Waters Corporation Inc., Beverly, Massachusetts 01915, United States
4. Department of Biochemistry and Molecular & Cellular Biology, Georgetown University Washington, District of Columbia 20057, United States