1. LacCore/CSDCO and Department Earth SciencesUniversity of Minnesota Minneapolis MN USA
2. Biostatistics Division, School of Public HealthUniversity of Minnesota Minneapolis MN USA
3. St. Croix Watershed Research StationScience Museum of Minnesota St. Paul MN USA
4. Plant and Earth Science DepartmentUniversity of Wisconsin River Falls River Falls WI USA
5. Minnesota Department of Health St. Paul MN USA
6. Now at Minnesota Department of Natural Resources St. Paul MN USA