[1] Leibniz Inst Social Sci, Mannheim & Fed Inst Populat Res BiB, GESIS, Wiesbaden, Germany
[2] Zittau Goerlitz Univ Appl Sci HSZG, Zittau, Germany
[3] Catholic Univ Eichstatt Ingolstadt KU, Eichstatt, Germany
[4] Wiesbaden & Johannes Gutenberg Univ Mainz, Fed Inst Populat Res BiB, Mainz, Germany