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Paediatric and perinatal epidemiology [Paediatr Perinat Epidemiol] 2015 Nov; Vol. 29 (6), pp. 562-6. Date of Electronic Publication: 2015 Sep 14.Publisher: Blackwell Scientific Publications Country of Publication: England NLM ID: 8709766 Publication Model: Print-Electronic Cited Medium: Internet
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American journal of epidemiology [Am J Epidemiol] 1972 May; Vol. 95 (5), pp. 418-30.Publisher: Oxford University Press Country of Publication: United States NLM ID: 7910653 Publication Model: Print Cited Medium: Print ISSN: