Source:http://linkedlifedata.com/resource/umls/id/C0003910
MSH: Disorders of the quality of speech characterized by the substitution, omission, distortion, and addition of phonemes.,NCI: A disorder characterized by the failure to use developmentally expected speech sounds that are appropriate for the individual's age (i.e., the individual makes errors in sound production or use or omits sounds such as final consonants).