<qa>  What was the idea of retrospectively comparing test results and clinical diagnoses?The companies had provided 70 tests for use. During use the idea arose to retrospectively correlate test results and clinical diagnoses. Thus, a study protocol was submitted to the ethics committee of the Medical Faculty of the Johann Wolfgang Goethe-University FrankfurtMain. All patients that were examined prior to the vote of the ethics committee were evaluated retrospectively. All following patients were recruited prospectively. 