The University of Newcastle, University of Gothenburg, Hunter Medical Research Institute, Hunter Medical Research Institute Clinical Research Design and Statistical Services, University of Newcastle (Australia) - Centre for Clinical Epidemiology and Biostatistics, University of Gothenburg, University of Gothenburg, affiliation not provided to SSRN, University of Newcastle, University of Newcastle, La Trobe University, University of Newcastle, University of Newcastle, University of Newcastle, University of Gothenburg and University of Gothenburg