1. Department of Oncology-Pathology, Karolinska Institutet, Stockholm, Sweden;
2. Theme Cancer, Patient Area Head and Neck, Lung, and Skin Cancer, Karolinska University Hospital, Stockholm, Sweden;
3. Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden;
4. Department of Medicine Solna, Clinical Epidemiology Unit, Karolinska Institutet, Stockholm, Sweden