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. 2016 Nov 15;24(2):77–88. doi: 10.1007/s10804-016-9248-3

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© The Author(s) 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 1 — Design and flowchart of the study. Participants were tested every fifth year in the Betula study and every tenth year in VIP. ^aDue to the study design, some participants from Sample 3 in the Betula study were not retested. ^bDue to the study design, participants from Sample 3 in Betula study were not retested. ^cDropouts are participants who were deceased or did not want to participate at the follow-up measurement. ^dFor some participants (n = 131), follow-up information regarding social network size was also available