Institution: | 1. Public Health Agency of Catalonia, Department of Health of Catalonia, Roc Boronat 83–95, 008005, Barcelona, Spain 7. CIBER of Epidemiology and Public Health (CIBERESP), Instituto de Salud Carlos III, Madrid, Spain 2. Centro Nacional de Microbiología, Instituto de Salud Carlos III, Madrid, Spain 3. Preventive Medicine and Epidemiology Service, Hospital Vall d’Hebron of Barcelona, Barcelona, Spain 4. Obstetrics Service, Hospital Josep Trueta of Girona, Girona, Spain 5. Gynaecology and Obstetrics Service, Hospital del Mar of Barcelona, Barcelona, Spain 6. Obstetrics Service, Hospital Vall d’Hebron of Barcelona, Barcelona, Spain
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