1. RCPA Quality Assurance Programs, St Leonards, Australia;
2. Institut für Klinische Chemie und Pathobiochemie Klinikum, Münich, Germany;
3. Laboratory Corporation of America Holdings, Elon, NC, USA;
4. The Netherlands Cancer Institute, Amsterdam, The Netherlands;
5. National University Hospital, Singapore, Singapore;
6. Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire, and the Geisel School of Medicine at Dartmouth, Hanover, NH, USA