Three novel mutations in CYP21 gene in brazilian patients with the classical form of 21-hydroxylase deficiency due to founder effect - Billerbeck, Ana Elisa C.; Mendonça, Berenice B.; Pinto, Emilia M.; Madureira, Guiomar; Arnhold, Ivo J. P.; Bachega, Tânia A. S. S. (The Journal of Clinical Endocrinology & Metabolism, 2002)