http://wikiless.i2p/wiki/Cleft_lip_and_cleft_palate?lang=en
Current Opinion in Otolaryngology & Head and Neck Surgery . 9 (6): 365–8. doi : 10.1097/00020840-200112000-00005 . S2CID 76256148 . ^ Kaplan EN (October 1975). "The occult submucous cleft palate". The Cleft Palate Journal . 12 : 356–68. PMID 1058746 . ^ Hanny KH, de Vries IA, Haverkamp SJ, Oomen KP, Penris WM, Eijkemans MJ, et al.