1. Basel Institute for Clinical Epidemiology and Biostatistics, Department of Clinical Research; University of Basel; Basel Germany
2. University Medical Library; University of Basel; Basel Switzerland
3. Basel Institute for Clinical Epidemiology and Biostatistics; University Hospital Basel; Basel Switzerland
4. Basel Institute for Clinical Epidemiology and Biostatistics, Department of Clinical Research; University of Basel; Basel Switzerland
5. Basel Institute for Clinical Epidemiology and Biostatistics, Department of Clinical Research; University of Basel; Basel Belgium
6. Heart Care Western Australia; Perth Australia
7. Department of Clinical Research; University Hospital Basel and University of Basel; Basel Switzerland