Kaspar, R.; Brijoux, T.; Albrecht, A.; Zimmermann, J.; Wenner, J.; Fey, J.; Reissmann, M.; Wagner, M.; Zank, S. Challenges and Benefits of Including the Institutionalized, Cognitively Impaired and Unable to Respond in a Representative Survey of the Very Old. SRM 2023, 17 (2), 111-129. https://doi.org/10.18148/srm/2023.v17i2.8008.