1 Institute of Health and Society, Clinical Effectiveness Research Group, University of Oslo, Oslo; Department of Medicine, Sørlandet Hospital, Kristiansand.
2 Institute of Health and Society, Clinical Effectiveness Research Group, University of Oslo, Oslo; Department of Transplantation Medicine, Oslo University Hospital, Oslo, Norway; Frontier Science Foundation, Boston.
3 Institute of Health and Society, Clinical Effectiveness Research Group, University of Oslo, Oslo; Department of Transplantation Medicine, Oslo University Hospital, Oslo, Norway.
4 Institute of Health and Society, Clinical Effectiveness Research Group, University of Oslo, Oslo; Department of Transplantation Medicine, Oslo University Hospital, Oslo, Norway; Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, USA.
5 Institute of Health and Society, Clinical Effectiveness Research Group, University of Oslo, Oslo; Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden. Electronic address: hadami@hsph.harvard.edu.