J F Ludvigsson

Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden

Department of Pediatrics, Örebro University Hospital, Örebro, Sweden

Division of Epidemiology and Public Health, School of Medicine, University of Nottingham, Nottingham, UK

Department of Medicine, Columbia University College of Physicians and Surgeons, New York, New York, USA