1. Radboud University Medical Center, Nijmegen, The Netherlands
2. Hospital Universitari Germans Trias I Pujol, Badalona, Spain
3. National Institute for Infectious Diseases ‘L. Spallanzani’, Rome, Italy
4. Saint-Pierre University Hospital, Brussels, Belgium
5. Chelsea & Westminster Hospital, London, UK
6. Klinikum der Universität München, Frauenklinik Innenstadt, München, Germany
7. Imperial College Healthcare NHS Trust, London, UK
8. Klinik für Geburtsmedizin, Charité Universitätsmedizin, Berlin, Germany
9. Institution for Infection and Immunity, St George's, University of London, London, UK
10. Erasmus Medical Center, Rotterdam, The Netherlands
11. University of Padua, Padova, Italy