After informed consent has been obtained, all study-specific information will be collected to determine if a patient meets the inclusion criteria without violating any of the exclusion criteria. A total number of 80 subjects will be enrolled, with an enrolment goal of 12 subjects per month. Recruitment will take place in the medical outpatient department (Klinik und Poliklinik für Innere Medizin) of the University Hospital in Zurich. If monthly enrolment goals cannot be achieved, announcements will be posted on the university's announcement boards and on the internet page of the USZ medical department. Patients will receive no financial compensation.