This thesis is completed with prayers of many and sacrificial love of my family and friends. I would like to thank all my fellow friends who had helped me in brainstorming, recruiting participants, and providing information for this study. However, there are a few people that I would like to specially acknowledge and extend my heartfelt gratitude who have made the completion of this research possible:
I want to thank the Department of Community Medicine of Hong Kong University for giving me permission to commence this thesis in the first instance, to do the necessary research work. I have furthermore to thank my supervisor Prof. Richard Fielding for he had given me his full support in guiding me with stimulating suggestions and encouragement to go ahead in all the time of research for and writing of this thesis. I am bound to Prof. Victor Wong Cheong Wing from the University of Baptist Hong Kong of the help and inspiration he extended. I am deeply indebted to my friend Prof. Lee V. Hamilton from the University of Baptist Hong Kong for the help in proofreading and given me various suggestions on how to improve the writing of this thesis.
My colleagues from the Department of Community Medicine had supported me in various areas of this research work. I want to thank them for all their help, support, interest and valuable hints. Especially I am obliged to Miss Patsy Chau Y.K. and Dr. Janice M. Johnston. Miss Joyce Fung H.Y. for her great help in administrative work.
My special thanks to the following people, Miss Vivian Chan W.Y. and Miss Wihelmina Ko Yuk Hang who had extended their help of the illustrations; Miss Hori Yukiko, Mr. Onishi Toshisada and Miss Connie Mak, Mr. Matthias Buerki, Miss Barbara Chan CY, Miss Flora Wu Da Dong, Miss Genie Au Lok Sang, Mr. Alex Wong Weng Wah, Mr. Shane D. Wright had gave me their greatest support in brainstorming and often of great help in difficult times.I would like to thank Full Gospel Assembly Kuala Lumpur of their prayers and financial support in making the printing of the bookmarks available. Most especially to my family and friends: Catherine, Sun Sun, Peter, Boh Yean and Bee Ngee. And to God, who made all things possible.