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Park ER, Storfer-Isser A, Kelleher KJ, Stein RE, Heneghan AM, Chaudron L, Hoagwood KE, O'Connor KG, Horwitz SM.Park ER, et al. Among authors: kelleher kj.Ambul Pediatr. 2007 May-Jun;7(3):239-46. doi: 10.1016/j.ambp.2007.03.002.Ambul Pediatr. 2007.PMID: 17512885