1. Intuitive Consulting Solutions LLC, Readfield, Maine, USA
2. Agriculture Laboratory Proficiency (ALP) Program, Collaborative Testing Services, Inc., Colorado State University, Fort Collins, Colorado, USA
3. R-Squared Diagnostics, LLC, Indianapolis, Indiana, USA
4. Center for Water and Air Quality, College of Agriculture and Food Sciences, Florida A&M University (FAMU), Tallahassee, Florida, USA