Most validated questionnaires that are widely used around the world are created in a non-native language. If such a questionnaire is to be used in a native-speaking population, it must first be validated. This book aims to be a useful guide for describing all the steps required for validating a questionnaire. This book also provided a standard checklist with 17 items that are recommended to serve as a useful guide for researchers conducting questionnaire validation research.

Analysis of patient data can be a complicated and challenging process, especially when the data involve many subjects and many variables. A patient registry is a database that organizes collecting the important set of data on a list of identifiable individuals for a specific disease. This type of data usually has tons of data and hundreds of different variables. Thus, the approach to conducting research by using a patient registry database will be more complicated than the other types of d...