1. Canadian Institute of Complementary and Alternative Medicine, University of Alberta Canada, # 105, 6303-104 Ave. NW Edmonton, AB, Canada T6A 0X9, Canada
2. Statistical Consulting Center, Wright State University, 130 MM Bldg., 3640 Colonel Glenn Hwy., Dayton, OH 45435, USA
3. University of Illinois, 314 Transportation Building, Urbana, IL 6180, USA