1. USDA Forest Service Southern Research Station Research Triangle Park North Carolina USA
2. USDA Forest Service Southern Research Station Asheville North Carolina USA
3. Nicholas School of the Environment Duke University Durham North Carolina USA
4. Department of Biological Sciences & Environmental Change Initiative University of Notre Dame Notre Dame Indiana USA
5. Department of Microbiology and Plant Biology University of Oklahoma Norman Oklahoma USA
6. Nicholas School of the Environment & Pratt School of Engineering Duke University Durham North Carolina USA
7. Department of Forest Science University of Helsinki Helsinki Finland