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BMC Health Services Research > 2018 > 18 > 1 > 1-18
European Journal of Epidemiology > 2016 > 31 > 10 > 967-997
BMC Research Notes > 2016 > 9 > 1 > 1-5
European Journal of Epidemiology > 2015 > 30 > 7 > 529-542
BMC Family Practice > 2015 > 16 > 1 > 1-9
BMC Public Health > 2015 > 15 > 1 > 1-8
European Journal of Epidemiology > 2009 > 24 > 4 > 181-192
Journal of General Internal Medicine > 2001 > 16 > 11 > 721-727