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Authors
Helbig, Sonja
Petersen, Antje
Sitter, Erika
Daly, Deirdre
Gross, Mechthild M. https://orcid.org/0000-0001-6348-0054
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Article History
Received: 14 December 2017
Accepted: 31 May 2019
First Online: 9 July 2019
Ethics approval and consent to participate
: Written consent was obtained from all participants.The study and research protocol were approved by the Ethical Review Board of Hannover Medical School (no. 3317–2016), and the study was exempt from full review.
: Not applicable.
: Mechthild M. Gross is a member of the editorial board (Associate Editor) of BMC pregnancy and childbirth. Otherwise, the authors declare that they have no competing interests.
