1. Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, Nebraska, USA
2. University of Nebraska Medical Center, High School Alliance, Omaha, Nebraska, USA
3. The Mass Spectrometry and Proteomics Core Facility, University of Nebraska Medical Center, Omaha, Nebraska, USA
4. Eppley Institute for Research in Cancer and Allied Diseases, Fred & Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, Nebraska, USA