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Kendrick D, Barlow J, Hampshire A, Stewart-Brown S, Polnay L.Kendrick D, et al. Among authors: polnay l.Child Care Health Dev. 2008 Sep;34(5):682-95. doi: 10.1111/j.1365-2214.2008.00849.x.Child Care Health Dev. 2008.PMID: 18796060Review.
Didcock E, Polnay L.Didcock E, et al. Among authors: polnay l.Public Health. 2001 Nov;115(6):412-7. doi: 10.1038/sj.ph.1900789.Public Health. 2001.PMID: 11781852
Blair M, Horn N, Polnay L.Blair M, et al. Among authors: polnay l.Public Health. 1997 Mar;111(2):97-100. doi: 10.1016/s0033-3506(97)90009-3.Public Health. 1997.PMID: 9090285