My first thanks go to all the participants who completed either the on-line questionnaire or pre-test sessions for this study. This research would not have been possible without your participation.

       I gratefully acknowledge the valuable assistance of my co-advisors, Dr. Phylis Moser-Veillon and Dr. Nadine Sahyoun. I am also very grateful to my dissertation committee members, Dr. Mira Mehta, Dr. Robert Feldman and Dr. Roger Tourangeau. Their vision and assistance has greatly helped me to maintain my enthusiasm for my doctorial research. I also want to thank all the faculty members in the Department of Nutrition and Food Science at the University of Maryland for giving me strongest education and warmest support.

       The following individuals generously assisted me by reviewing the questionnaire: Dr. Wenhua Zhao, Dr. Junshi Chen and Dr. Suying Chang from the Chinese Academy of Preventive Medicine, Beijing China; Dr. Manjiang Yao and Dr. Susan Robert from Tufts University, MA, USA, Dr. Amy Subar from the National Cancer Institute, NIH, Bethesda, MD, USA, and Dr. Mailyn Tseng and Dr. Yun Song from the Fox Chase Cancer Center, PA, USA. I appreciate their expertise and valuable contribution very much.

       To Dr. Teresita Hernandez (Health Technomics Inc.), I extend my appreciation for her significant guidance and technical support on developing a dietary assessment tool. I also thank Dr. Yuling Pan (Sociolinguist) from the U.S. Census Bureau for reviewing and correcting the Chinese translation and her advices on conducting survey among different ethnic groups.

       Special thanks to Dr. Richard Ahrens and Mrs. Joan Ahrens for their generosity. In addition to correcting my English writing and speaking whenever necessary, they provided me with a warm home in Maryland and they enriched my stay in the United States.

       Words cannot express my gratitude to Mr. Donald G. Gross, a knowledgeable friend and mentor. Talking with Donald is always delightful and enlightening. From Beijing to Maryland, from Pfizer to the University of Maryland, to NIH, every step I took, his advice was with me.

       I sincerely thank my friends, schoolmates and my colleagues in the University of Maryland and the Office of Dietary Supplements at the National Institutes of Health, who helped me in English translation. I also give my thanks to my family in Chang Chun, China. My family is always my firmest support through my life.

       Last but not least, this site would still be in the wildness without the assistance of 8848 Inc. in Beijing, who built the websites for this research and provided the space for hosting the site, so this site can be accessed from from either China or the United States. I also thank Miss Aviva Wu and Mr. Marks Yang for their outstanding work in designing, developing and maintaining the websites.