1. Department of Chemistry and Biochemistry, University of Denver , Denver, CO , USA
2. Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego , San Diego, CA , USA
3. Collaborative Mass Spectrometry Innovation Center, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego , La Jolla, CA , USA
4. Department of Pediatrics, University of California San Diego , La Jolla, CA , USA
5. Department of Analytical Chemistry, University of Vienna , Vienna , Austria
6. Bioinformatics Group, Wageningen University & Research , Wageningen , The Netherlands
7. Chiba University, UC San Diego Center for Mucosal Immunology, Allergy, and Vaccines (CU-UCSD cMAV) , La Jolla, CA , USA