Laboratory diagnosis of guanidinoacetate methyltransferase defi ciency by tandem mass spectrometry - Bártl, Josef; Chrastina, Pavel; Zvoníčková, Jana; Košťálová, Eva; Šťastná, Sylvie; Behúlová, Darina; Šalingová, Anna; Kolníková, Miriam (Klinická biochemie a metabolismus, 2009)