Received: 18 December 2019
Accepted: 17 March 2020
First Online: 28 April 2020
Ethics approval and consent to participate
: As this study is a retrospective analysis of data previously published in the literature 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 the company SoBi.