The study was a step-by-step process. In the first investigation in 2013 the investigators included 50 patients and 81 patients in 2016. Questionnaires were identical in both testing stages for comparability. Practicability of a computer-based questionnaire on patient medical history, diagnosis as well as behavior guidelines was tested at anesthesia ambulance. Moreover, the investigators evaluated the user satisfaction with the help of a separate anonym paper-based questionnaire in 2013 as well as in 2016.