1. Mass Spectrometry Research Center; Vanderbilt University; Nashville Tennessee USA
2. Department of Biomedical Engineering; Vanderbilt University; Nashville Tennessee USA
3. Department of Chemistry; Vanderbilt University; Nashville Tennessee USA
4. Department of Biochemistry; Vanderbilt University; Nashville Tennessee USA
5. Department of Pharmacology; Vanderbilt University; Nashville Tennessee USA
6. Department of Medicine; Vanderbilt University; Nashville Tennessee USA