Scherpenzeel, A.; Axt, K.; Bergmann, M.; Douhou, S.; Oepen, A.; Sand, G.; Schuller, K.; Stuck, S.; Wagner, M.; Börsch-Supan, A. Collecting Survey Data Among the 50+ Population During the COVID-19 Outbreak: The Survey of Health, Ageing and Retirement in Europe (SHARE). SRM 2020, 14, 217-221.