- Correspondence to Dr Isaure de Beaurepaire, Département de Radiopédiatrie, Hôpital Necker-Enfants Malades, Bâtiment Laennec, Paris 75015, France;
- Received 9 October 2017
- Revised 12 December 2017
- Accepted 29 December 2017
- Published online 22 January 2018.
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