Expanded nursing roles to promote person-centred care for people with cognitive impairment in acute care (ENROLE-acute): study protocol for a controlled clinical trial, process and... oleh Verena von der Lühe, Marcelina Roos, Mareike Löbberding, Nadine Scholten, Wiebke Müller, Martin Hellmich, Dusan Simic, Sascha Köpke, Martin N. Dichter