Frequency of the 'delta'F508 mutation in 108 cystic fibrosis patients in São Paulo: comparison with reported brasilian data - Okay, Thelma Suely; Raiz Junior, Roberto; Del Negro, Gilda Maria Bárbaro; Leone, Cléa Rodrigues; Oliveira, Wagner Paes; Rodrigues, Joaquim Carlos (Clinics, 2005)