I would like to thank all the teachers from school of Nursing, Central South University and my special gratitude goes to the my supervisor Prof. Chen Yongyi for the support, guidance and direction over last two years. Thank you for your input and careful edits. Prof. Chen Yonyi and Prof.Sun Min showed great mentorship, was approachable and had good advice. I would also like to thank my Chinese friends specially Ms Qinqin for supporting me during data collection, translation and helping me to carry on my masters studies. And special thanks to all nurses in hospital who participated in this study for their cooperation. I am grateful for the support given to me by my husband and my parents.