1. Department of Chemical Pathology, Queensland Health Pathology Service, Princess Alexandra Hospital, Ipswich Road, Woolloongabba, QLD 4102, Australia
2. Department of Biochemistry, Sullivan Nicolaides Pathology, Indooroopilly, QLD 4068, Australia
3. Roche Diagnostics Australia, Castle Hill, NSW 2154, Australia
4. Department of Chemical Pathology, Queensland Health Pathology Service, The Prince Charles Hospital, Chermside, QLD 4032, Australia