- Correspondence to Dr Jonas F Ludvigsson, Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, 17177 Stockholm, Sweden;
- Received 31 January 2017
- Accepted 5 February 2017
- Published in print 1 November 2017.
- Published online 9 October 2017.
- Published first 23 February 2017.
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