Translation of a questionnaire from German to English

Hello, I have a German language questionnaire that needs to be translated into English. I have posted the document so that you can have first hand look at it an know what you are getting into. Since this is a scientific research project, the questionnaire needs to be handled pretty carefully, meaning, the semantics, structure and style need to be we'll thought through. If you should have any questions, please don't hesitate to contact me. Thanks for your interest! Kind regards, Robert