1. Mikael Eriksson, PhD, Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden; Kamila Czene, PhD, Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden; and Per Hall, PhD, MD, Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden, Department of Oncology, Södersjukhuset, Stockholm, Sweden