- Correspondence to Dr Ulrich Pfeifer, Pediatric Neurology and Metabolic Medicine, Center for Pediatric and Adolescent Medicine, Heidelberg University Hospital, 69120 Heidelberg, Germany;
- Received October 7, 2019
- Revised January 22, 2020
- Accepted January 27, 2020
- First published February 14, 2020.
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