1 Mikael Eriksson, PhD, Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden; Emily F. Conant, MD, and Despina Kontos, PhD, Department of Radiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA; and Per Hall, MD, PhD, Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden, Department of Oncology, Södersjukhuset University Hospital, Karolinska Institutet, Stockholm, Sweden.