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1 Professor Emeritus, Department of Pathology and Laboratory Medicine, School of Medicine and Public Health, University of Wisconsin, Madison, WI 53705, USA; Westgard QC, Inc., Madison, WI, USA. Electronic address: James@westgard.com.
2 Clinical Chemistry, Abbott Diagnostics, Department 09AC, Building CP1-5, 100 Abbott Park Road, Abbott Park, IL 60064, USA. Electronic address: david.armbruster@abbott.com.
3 Client Services and Technology, Westgard QC, Inc., 7614 Gray Fox Trail, Madison, WI 53717, USA. Electronic address: westgard@westgard.com.
1 Professor Emeritus, Department of Pathology and Laboratory Medicine, School of Medicine and Public Health, University of Wisconsin, Madison, WI 53705, USA; Westgard QC, Inc., Madison, WI, USA. Electronic address: James@westgard.com.
2 Clinical Chemistry, Abbott Diagnostics, Department 09AC, Building CP1-5, 100 Abbott Park Road, Abbott Park, IL 60064, USA. Electronic address: david.armbruster@abbott.com.
3 Client Services and Technology, Westgard QC, Inc., 7614 Gray Fox Trail, Madison, WI 53717, USA. Electronic address: westgard@westgard.com.