ORIGINAL PAPER Rebecca J Ward, Department of Clinical Biochemistry, University Hospitals of the North Midlands NHS Trust, Stoke-on-Trent, UK Currently working at St Mary’s Surgery, Ely, Cambridgeshire, UK Search for more papers by this author Anthony A Fryer, orcid.org/0000-0001-8678-0404 Department of Clinical Biochemistry, University Hospitals of the North Midlands NHS Trust, Stoke-on-Trent, UK School of Medicine, Keele University, Stoke-on-Trent, UK Search for more papers by this author...