Received: 2 March 2020
Accepted: 16 December 2020
First Online: 7 January 2021
Ethics approval and consent to participate
: The SHARE Project respects the Declaration of Helsinki in terms of anonymity of the participants and obtaining of written consents. Furthermore, the latest waves have been reviewed and approved by the Ethics Committee of the Max Planck Society. In addition, the country implementations of SHARE were reviewed and approved by the respective ethics committees or institutional review boards.
: Not applicable.
: The authors declare that they have no competing interests.