1. Department of Microbiology, Immunology & Pathology, Des Moines University, Des Moines, Iowa, 50312, United States
2. Department of Surgery, University of Missouri School of Medicine, Columbia, MO, 65212, United States
3. Department of Microbiology, Immunology & Pathology, Des Moines University College of Osteopathic Medicine, Des Moines 50312, Iowa, United States