1. School of Life Sciences, Arizona State University, Tempe, Arizona, USA
2. Center for Educational Assessment, Center for the Advancement of Teaching, Division of Undergraduate Education, University of California Los Angeles, Los Angeles, California, USA
3. Department of Microbiology, Immunology & Molecular Genetics, University of California Los Angeles, Los Angeles, California, USA
4. Department of Biomedical Science, Kaiser Permanente Bernard J. Tyson School of Medicine, Pasadena, California, USA