Funding for this research was provided by:
Russian program of the state support of leading universities of the Russian Federation “5–100”
Max Planck Institute for Demographic Research
Article History
Received: 13 August 2020
Accepted: 15 November 2021
First Online: 10 December 2021
Declarations
:
: The authors declare that they have no conflicts of interest.
: Publication of the manuscript has been approved by all the co-authors as well as the responsible authorities.