[1] Grp Hlth Cooperat Puget Sound, Seattle, WA USA
[2] Univ Florida, Hlth Sci Ctr, Jacksonville, FL 32209 USA
[3] Roche Diagnost Corp, Indianapolis, IN USA
[4] Roche Diagnost GmbH, Mannheim, Germany
[5] Univ Gottingen, D-3400 Gottingen, Germany
[6] Ctr Hosp Reg Citadelle, Liege, Belgium