1. Division of Infectious Diseases; University Hospital Bern; Bern Switzerland
2. Division of Infectious Diseases & Hospital Epidemiology; University Hospital Zurich; University of Zurich; Zurich Switzerland
3. Division of Infectious Diseases; Cantonal Hospital St Gallen; St Gallen Switzerland
4. University Children's Hospital Basel; Basel Switzerland
5. University Women's Hospital Basel; Basel Switzerland
6. Division of Infectious Diseases; University Hospital Basel; Basel Switzerland
7. Division of Infectious Diseases; Regional Hospital; Lugano Switzerland
8. Division of Infectious Diseases; University Hospital Lausanne; Lausanne Switzerland
9. University Women's Hospital Zurich; Zurich Switzerland
10. Division of Infectious Diseases; University Hospital Geneva; Geneva Switzerland
11. Data Centre of the Swiss HIV Cohort Study; Institute for Social and Preventive Medicine; University of Lausanne; Lausanne Switzerland
12. Population, Policy and Practice Programme; UCL Institute of Child Health; University College London; London UK
13. Department of Obstetrics and Gynaecology; University Hospitals of Geneva and Faculty of Medicine; Geneva Switzerland