Discoloration of the Teeth in Older Children with Cystic Fibrosis of the Pancreas Zegarelli, E.V.; Kutscher, A.H.; Denning, C.R.; Applebaum, E.; Fahn, B.S.; Hoffman, P.J.; Botwick, J.T.; Ragosta, J.M. American Journal of Digestive Diseases 9: 682-683 1964 0002-9211 10.1007/bf02237725 https://eurekamag.com/research/024/497/024497607.php