James Burke of Duke University is one of the authors of a study reviewing previous research on cognitive decline.

VOA: standard.2010.06.17

Researcher Katariina Kallio of the University of Turku in Finland says her study on teenagers extends previous research, which found cardiovascular damage in grown-ups who breathed in other peoples' smoke.

VOA: standard.2010.03.04

"A previous study on the genetics of placebo in social anxiety disorder showed that it is serotonin that is associated to placebo responsiveness and not dopamine, " he said.

BBC: Placebo effect may be 'down to genes'

The study builds on previous research which has shown the insula is involved in the onset of mood disorders.

BBC: Mental health (generic)

Dr Ray and his colleague Dr Nicholas Brereton said the latest work built on previous work involving a wider study on willow varieties at the national collection at Rothamsted Research, which is the longest running agricultural research station in the world.

BBC: Sugar-rich willow can boost biofuels' green credentials