TBX1 and Hip dysplasia: CNV of Affymetrix SNP array data showed a 437 kb microduplication on 22q11.21 involved in T-box transcription factor 1 (TBX1), catechol-O-methyltransferase (COMT), septin 5 (SEPT5), G protein subunit beta 1 like (GNB1L), thioredoxin reductase 2 (TXNRD2) and glycoprotein Ib plateletsubunit beta (GP1BB) (Weisfeld-Adams et al., 2012), which have not been reported to be associated with DDH.