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Doyle LW, Keir E, Kitchen WH, Ford GW, Rickards AL, Kelly EA.Doyle LW, et al. Among authors: rickards al.Pediatrics. 1992 Nov;90(5):744-9.Pediatrics. 1992.PMID: 1408548
Rickards AL, Kitchen WH, Doyle LW, Ford GW, Kelly EA, Callanan C.Rickards AL, et al.J Dev Behav Pediatr. 1993 Dec;14(6):363-8.J Dev Behav Pediatr. 1993.PMID: 8126227