Dr. Gill Rumsby BTech, MSc, PhD, CSci, FRCPath, EuroClinChem, is the Clinical Lead and Consultant Clinical Biochemist at the Department of Clinical Biochemistry, University College London Hospitals. Dr. Gary M Woodward BSc (hons), PhD, MSc, MRCPath, is a Principal Clinical Biochemist and Honorary Lecturer at the Department of Clinical Biochemistry, University College London Hospitals.