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- universitat ulm33
- ruhr-universitat bochum, universitatsbibliothek22
- universitat tubingen20
- philipps-universitat marburg13
- philipps-universitat marburg, medizin9
- publikationsserver der rwth aachen university6
- universitat des saarlandes6
- german medical science gms publishing house; dusseldorf4
- frontiers media s.a.3