Welz, Julia http://orcid.org/0000-0003-0102-6053
Keyver-Paik, Mignon-Denise
Gembruch, Ulrich
Merz, Waltraut Maria
Article History
Received: 27 December 2018
Accepted: 24 April 2019
First Online: 8 May 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The University Bonn Institutional Review Board does not require formal approval for retrospective observational studies, therefore, ethics approval was not sought. For the questionnaire, written informed consent was obtained from all women.