1. Department of Maternal-Fetal Medicine; Institut Clinic de Ginecologia, Obstetricia i Neonatologia; Hospital Clinic-IDIBAPS, University of Barcelona; Barcelona; Spain
2. Microbiology Service; Biomedical Diagnosis Centre; Hospital Clinic-IDIBAPS, University of Barcelona; Barcelona; Spain
3. Department of Pathology, Hospital Clinic-IDIBAPS; University of Barcelona; Barcelona; Spain