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Gummer, Tobias, Schmiedeberg, Claudia, Bujard, Martin, Christmann, Pablo, Hank, Karsten, Kunz, Tanj A., Lueck, Detlev and Neyer, Franz J. (2020). The impact of COVID-19 on fieldwork efforts and planning in pairfam and FReDA-GGS. Surv. Res. Methods, 14 (2). S. 223 - 227. DUISBURG: EUROPEAN SURVEY RESEARCH ASSOCIATION. ISSN 1864-3361