1. Wood Science & Engineering, 119 Richardson Hall, Oregon State University, Corvallis, OR 97331-5751, USA
2. Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, Northeast Forestry University, China
3. USDA Forest Service, PNW Research Station, Corvallis, OR 97331, USA
4. Centers for Disease Control and Prevention, Fort Collins, CO 80522, USA