1. 1Department of Human Nutrition, The Ohio State University, Columbus, Ohio 43210-1295
2. 2Center for Social and Economic Behavior Studies, Yunnan University of Finance and Economics, Kunming, 650221 Yunnan Province, People's Republic of China
3. 3Department of Food Science and Human Nutrition, Washington State University, Pullman, Washington 99164-6376
4. 4Department of Food Science and Human Nutrition, Colorado State University, Fort Collins, Colorado 80523-1571, USA