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BMC Medical Research Methodology > 2018 > 18 > 1 > 1-11
Academic Pediatrics > 2018 > 18 > 1 > 3-7
Academic Pediatrics > 2014 > 14 > 5 > 505-509
Academic Pediatrics > 2014 > 14 > 3 > 309-314
Academic Pediatrics > 2013 > 13 > 5 > 421-429