@ARTICLE{
author={de Waal Margot WM,van Dalen-Kok Annelore H,de Vet Henrica CW,Gimenez-Llort Lydia,Konstantinovic Ljubica M,de Tommaso Marina,Fischer Thomas,Lukas Albert,Kunz Miriam,Lautenbacher Stefan,Lobbezoo Frank,McGuire Brian E,Van der Steen Jenny T,Achterberg Wilco P},
year={2020},
title={Observational pain assessment in older persons with dementia in four countries: Observer agreement of items and factor structure of the Pain Assessment in Impaired Cognition},
journal={EUROPEAN JOURNAL OF PAIN},
volume={24},
number={2},
pages={279-296},
document_type={Article},
}