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Elsevier, The Lancet, 9701(374), p. 1597-1605, 2009

DOI: 10.1016/s0140-6736(09)61836-5

Elsevier, Year Book of Pediatrics, (2011), p. 487-489

DOI: 10.1016/s0084-3954(10)79688-3

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