1. Department of Pathology, Microbiology and Immunology, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
2. Mass Spectrometry Research Center, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
3. Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
4. Department of Medicine, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
5. Veterans Affairs Tennessee Valley Healthcare System, Nashville, Tennessee, USA