[1] Prevention,Department of Communicable Disease Control
[2] Uppsala County Council,Department of Communicable Disease Control
[3] Prevention,National Institute of Public Health
[4] Stockholm County Council,Department of Medical Sciences
[5] National Institute of Hygiene,The Karolinska Institute, Department of Medicine
[6] Uppsala University,undefined
[7] Infectious Disease Unit,undefined
[8] Karolinska University Hospital,undefined
[9] Child Health Memorial Institute,undefined