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Hysing M, Harvey AG, Torgersen L, Ystrom E, Reichborn-Kjennerud T, Sivertsen B.Hysing M, et al.J Dev Behav Pediatr. 2014 Jun;35(5):309-16. doi: 10.1097/DBP.0000000000000064.J Dev Behav Pediatr. 2014.PMID: 24906032