1 Division of Cancer Epidemiology, German Cancer Research Center (DKFZ), Heidelberg, Germany.
2 Medical Faculty, University of Heidelberg, Heidelberg, Germany.
3 Department of Neurology, University of Heidelberg, Heidelberg, Germany.
4 Institute of Transfusion Medicine and Immunology, Heidelberg University, Medical Faculty Mannheim, and German Red Cross Blood Service Baden-Württemberg-Hessen, Mannheim, Germany.
5 Division of Cancer Epidemiology, German Cancer Research Center (DKFZ), Heidelberg, Germany. [email protected].