Funding for this research was provided by:
Institute of Women's Health, Tübingen, Germany
Text and Data Mining valid from 2019-02-08
Received: 18 November 2018
Accepted: 31 January 2019
First Online: 8 February 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: The study was approved by the Federal Insurance Office of Germany (Bundesversicherungsamt, Reference Number IT 5 - 8269 - 70/2014, approved on 16 January 2014).