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BMC Medical Research Methodology > 2018 > 18 > 1 > 1-12
BMC Medical Research Methodology > 2018 > 18 > 1 > 1-9
BMC Public Health > 2014 > 14 > 1 > 1-9
BMC Medical Research Methodology > 2018 > 18 > 1 > 1-12
BMC Medical Research Methodology > 2018 > 18 > 1 > 1-9
BMC Public Health > 2014 > 14 > 1 > 1-9