1. Assistant Professor, Dept. of Building Engineering, Tongji Univ., 1239 Siping Rd., Shanghai 200092, China; formerly, Ph.D. Student, Dept. of Wood Science, Univ. of British Columbia, 2424 Main Mall, Vancouver, BC V6T 1Z4, Canada (corresponding author).
2. Professor, Dept. of Wood Science, Univ. of British Columbia, 2424 Main Mall, Vancouver, BC V6T 1Z4, Canada.