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List study centres and corresponding ethics committees or institutional review boards.
A representative sampling method was not feasible and contacted practitioners were selected based on prior participation in a problem list study at the hospitals.
On the basis of the randomisation list, study drugs will be prepared and packaged in identical packages by the pharmacy of the University Medical Centre Mainz.
The research question was clearly defined with distinct inclusion and exclusion criteria, as well as status on the heart transplant waiting list, study period, and type of device used, resulting in a relatively homogeneous study population.
Upon the list, study classes were drawn using random numbers generated by the random function of a calculator until the cumulative number of students reached the expected number, i.e., 10%% of all undergraduate students in the university.
