1. Department of Biology, University of Wisconsin-La Crosse, La Crosse, Wisconsin, USA.
2. Department of Chemistry, University of Wisconsin-La Crosse, La Crosse, Wisconsin, USA.
3. Department of Microbiology, University of Wisconsin-La Crosse, La Crosse, Wisconsin, USA.
4. Department of Student Health Center, University of Wisconsin-La Crosse, La Crosse, Wisconsin, USA.