Husebo, B. S., Achterberg, W. P., Lobbezoo, F., Kunz, M., Lautenbacher, S., Kappesser, J., Tudose, C. and Strand, L. I. (2012) “Pain in patients with dementia: A review of pain assessment and treatment challenges”, Norsk Epidemiologi, 22(2). doi: 10.5324/nje.v22i2.1572.