1. Department of Pharmacy Sciences, School of Pharmacy and Health Professions, Creighton University, Omaha, NE, USA
2. Department of Medical Microbiology and Immunology, School of Medicine, Creighton University, Omaha, NE, USA
3. Department of Microbiology, Immunology and Pathology, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO, USA