- Correspondence to Dr Jonas F Ludvigsson, Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm 17177, Sweden; Dr Steffen Husby, Hans Christian Andersen Children's Hospital, Odense University Hospital, DK-5000 Odense, Denmark;
- Received 1 February 2016
- Revised 23 March 2016
- Accepted 27 March 2016
- Published online 18 April 2016.
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