1. Department of Biomedical Engineering, Wisconsin Institutes for Discovery, and Materials Science and Program, University of Wisconsin-Madison, Madison, WI 53715 US.
2. USDA Forest Service, Forest Products Laboratory, Madison, WI 53726 US.
3. USDA Forest Service, Forest Products Laboratory, Madison, WI 53726 US(Corresponding author), e-mail: jfhunt@fs.fed.us