E McMahon, Marta Buszewicz, Mark Griffin, Jennifer Beecham, Eva-Maria Bonin, F Rost, K Walters, Michael King (2012)
International Journal of Family Medicine
https://doi.org/10.1155/2012/316409
http://www.hindawi.com/journals/ijfm/2012/316409/
Available online: 7 June 2012
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