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1 Institute of Environmental Medicine, Karolinska Institutet, P.O. Box 210, SE-171 77 Stockholm, Sweden; E-Mails: [email protected] (M.F.); [email protected] (D.P.); [email protected] (M.T.) 2 Regional Cancer Center, Uppsala/Örebro and The National Board of Health and Welfare, SE-112 59 Stockholm, Sweden; E-Mail: [email protected] 3 Nordic Collaborating Centre for Classifications in Health Care, P.O. Box 7000, St. Olavs Pass, NO-0130 Oslo, Norway; E-Mail: [email protected] 4 Department of Clinical Neuroscience, Karolinska Institutet, SE-171 77 Stockholm, Sweden; EMail: [email protected] 5 Neurosurgery Clinic at the Karolinska University Hospital, SE-171 76 Solna, Sweden 6 Section of Environment and Radiation, International Agency for Research on Cancer, 150 Cours Albert Thomas, 69372 Lyon, France; E-Mail: [email protected]