Achterberg WP, Gambassi G, Finne-Soveri H, Liperoti R, Noro A, Frijters DHM, Cherubini A, Dell'Aquila G, Ribbe MW.  2010.  Pain in European long-term care facilities: cross-national study in Finland, Italy and The Netherlands. Pain. 148(1):70-74.

Baller M, Boorsma M, Frijters DHM, van Marwijk HWJ, Nijpels G, van Hout HPJ.  2010.  Depression in Dutch homes for the elderly: under?diagnosis in demented residents? International journal of geriatric psychiatry. 25(7):712-718.