Media type: E-Article Title: Measurement of informal care: an empirical study into the valid measurement of time spent on informal caregiving Contributor: van den Berg, Bernard; Spauwen, Pol imprint: Wiley, 2006 Published in: Health Economics Language: English DOI: 10.1002/hec.1075 ISSN: 1057-9230; 1099-1050 Origination: Footnote: