Estimate of the intrafamilial correlation for serum creatine kinase (ck) and pyruvate kinase (pk) in females at risk for duchenne (dmd) and becker (dmb) muscular dystrophies - Rabbi-Bortolini, E; Colletto, G M D D; Passos-Bueno, Maria Rita; Vainzof, Mariz; Rapaport, D; Zatz, Mayana (Human Heredity, 1991)