Funding for this research was provided by:
Repronatal Foundation, Basel, Switzerland (none)
Text and Data Mining valid from 2019-08-28
Received: 15 March 2019
Accepted: 16 August 2019
First Online: 28 August 2019
Compliance with ethical standards
: The study was presented to and approved by the local ethics committee (EKBB178/12) and monitored by the clinical trial unit (CTU) of the University Hospital of Basel.
: The authors declare that they have no conflict of interest.