A retrospective study of hearing, speech, and language function in children with clefts following palatoplasty and veloplasty precedures at 18 - 24 months of age - Schönweiler,R.; Lisson,J.A.; Schönweiler,B.; Eckardt,A.; Ptok,M.; Tränkmann,J.; Hausamen,J.E. (Int. J. Pediatr. Otorhinolaryngol., 1999)