1Department of Medicine, Karolinska Institute, Stockholm, Sweden. E-mail: [email protected], 2Department of Medicine, Karolinska Institute, Stockholm, Sweden. E-mail: [email protected], 3Department of Medicine, Karolinska Institute, Stockholm, Sweden. E-mail: [email protected], 4Technische Universität München, Inst. for Microbiology, Immunology, and Hygiene, Munich, Germany. E-mail: [email protected], 5Technische Universität München, Inst. for Microbiology, Immunology, and Hygiene, Munich, Germany. E-mail: [email protected], 6Department of Medicine, Karolinska Institute, Stockholm, Sweden. E-mail: [email protected]