1. Centre for Clinical Science and Measurement, School of Biomedical and Molecular Sciences, University of Surrey, Guildford, Surrey GU2 7XH, UK
2. Centre for Clinical Science and Measurement, School of Biomedical and Molecular Sciences, University of Surrey, Guildford, Surrey GU2 7XH, UK; SAS Peptide Hormone Section, Clinical Biochemistry Department, Royal Surrey County Hospital NHS
Trust, Guildford, Surrey GU2 7XX, UK