Funding for this research was provided by:
Max Planck Institute for Demographic Research
Article History
Received: 6 July 2018
Revised: 6 December 2019
Accepted: 10 December 2019
First Online: 23 December 2019
Compliance with Ethical Standards
: The authors declare that they have no conflicts of interests. All institutional and national guidelines for the care and use of laboratory animals were followed. This work was funded by the Max Planck Institute for Demographic Research, Rostock, Germany, for A.D, R.S., and M.J.D. The funders had no role in the study design, data collection or analysis, the decision to publish, or the preparation of the manuscript.