- Correspondence to Dr Christian R Kahrs, Department of Pediatrics, Østfold, Hospital Trust, Kalnesveien 300, Grålum 1714, Norway;
- Received 4 November 2016
- Revised 27 March 2017
- Accepted 25 April 2017
- Published in print 17 July 2017.
- Published online 18 July 2017.
- Published first 13 June 2017.
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