Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC 20057, USA, Bradley Department of Electrical and Computer Engineering, Virginia Tech, Arlington, VA 22203, USA, Department of Mathematics and Statistics, Georgetown University, Washington, DC 20057, USA, Proteomics and Mass Spectrometry Research Facility, Mitchell Cancer Institute, University of South Alabama, Mobile, AL 36604, USA and Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX 79409, USA.