Pengarang: John D. Olson

Dr Steve Kitchen, Clinical Scientist, Sheffield Hemophila and Thromobosis Centre, Royal Hallamshire Hospital and Scientific Director, UK National External Quality Assessment Scheme (FQAS) for Blood Coagulation, Scientific Director, WHO and WFH International External Quality Assessment Programs for Blood Coagulation, Sheffield, UK. John D Olson, Professor and Vice Chair for Clinical Affairs, Department of Pathology, University of Texas Health Sciences Centre, San Antonio, Texas, USA. F. Eric Preston, Emeritus Professsor of Hematology, University of Sheffield and Director, WHO and WFH International External Quality Assessment Programs for Blood Coagulations, Sheffield, UK.