1. USDA Forest Service, Forest Products Laboratory, Madison, WI 53726, USA
2. Department of Biological Systems Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA
3. Warnell School of Forestry and Natural Resources, University of Georgia, Athens, GA 30602, USA
4. Department of Wood Science and Engineering, Oregon State University, Corvallis, OR 97331, USA