1. Institute of Virology, Campus Charité MitteCharité – Universitätsmedizin Berlin Berlin Germany
2. Institute of VirologyUniversity of Bonn Medical Centre Bonn Germany
3. Placenta Laboratory, Department of ObstetricsUniversity Hospital Jena Jena Germany
4. Department of Obstetrics and Prenatal MedicineUniversity Bonn Medical School Bonn Germany
5. Berlin Institute of Health Berlin Germany