Received: 20 November 2019
Accepted: 28 January 2020
First Online: 14 February 2020
Change Date: 10 January 2022
Change Type: Correction
Change Details: A Correction to this paper has been published:
Change Details: https://doi.org/10.1186/s13023-021-02154-z
Ethics approval and consent to participate
: As this study is a retrospective analysis of data published in the literature already no ethic approval was required.
: Not applicable.
: SCG declares that she does not have competing interests. JOS serves as consultant of a medical diagnostic laboratory in ketone body metabolism and he and his institution have received honoraria/a reimbursement by Swedish Orphan Biovitrum GmbH.