Contributors are: Tony Ballantyne, Antoinette Burton, Adrian Carton, David Haines, Katherine Ellinghaus, Charlotte Macdonald, Michael A. McDonnell, Kirsten McKenzie, Michelle Moran, Fiona Paisley, Adele Perry, Dana Rabin, Christine M. Skwiot, Rachel Standfield, Frances Steel, Elizabeth Vibert, and Kerry Wynn.
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A 2009 study studied this question.