1. Sachs′ Children and Youth Hospital; South General Hospital; Stockholm Sweden
2. Department of Medicine; Clinical Epidemiology Unit; Karolinska Institutet; Stockholm Sweden
3. CHESS, Centre for Health Equity Studies; Stockholm University and Karolinska Institutet; Stockholm, Sweden
4. Public Health Agency of Sweden; Stockholm Sweden
5. Department of Public Health Sciences; Division of Global Health; Karolinska Institutet; Stockholm Sweden
6. Mälardalen University; Västerås Sweden
7. Stockholm County Council; Department of Communicable Disease Control and Prevention; Stockholm Sweden
8. Unit of Infectious Diseases; Department of Medicine, Karolinska Solna; Karolinska Institutet; Stockholm, Sweden