Guanidinoacetate/Creatine:SRto:Pt:Ser/Plas:Qn
guanidinoacetate/creatine:srto:pt:ser/plas:qn
Guanidinoacetate/Creatine [Molar ratio] in Serum or Plasma
guanidinoacetate/creatine [molar ratio] in serum or plasma