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Iben Rix Center for Clinical Metabolic Research, Gentofte Hospital, University of Copenhagen, Hellerup, Denmark
Zealand Pharma A/S, Søborg, Denmark

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Marie L Johansen Department of Medicine, Herlev Hospital, University of Copenhagen, Herlev, Denmark

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Asger Lund Center for Clinical Metabolic Research, Gentofte Hospital, University of Copenhagen, Hellerup, Denmark

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Malte P Suppli Center for Clinical Metabolic Research, Gentofte Hospital, University of Copenhagen, Hellerup, Denmark

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Elizaveta Chabanova Department of Radiology, Herlev Hospital, University of Copenhagen, Herlev, Denmark

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Gerrit van Hall Clinical Metabolomics Core Facility, Department of Clinical Biochemistry, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark

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Jens J Holst Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark

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Nicolai J Wewer Albrechtsen Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
Department of Clinical Biochemistry, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark

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Caroline Kistorp Department of Endocrinology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark

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Filip K Knop Center for Clinical Metabolic Research, Gentofte Hospital, University of Copenhagen, Hellerup, Denmark
Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
Steno Diabetes Center Copenhagen, Herlev, Denmark

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) ( 23 ) with an intra-assay and inter-assay coefficient of variation (CV) of <10% ( 24 ). Individual amino acids were measured from lithium-heparinized plasma using liquid chromatography–tandem mass spectrometry (LS-MS/MS) (TSQ Quantiva, Thermo Fisher

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Christian Trummer Department of Internal Medicine, Division of Endocrinology and Diabetology, Medical University of Graz, Graz, Austria

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Stefan Pilz Department of Internal Medicine, Division of Endocrinology and Diabetology, Medical University of Graz, Graz, Austria

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Verena Schwetz Department of Internal Medicine, Division of Endocrinology and Diabetology, Medical University of Graz, Graz, Austria

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Barbara Obermayer-Pietsch Department of Internal Medicine, Division of Endocrinology and Diabetology, Medical University of Graz, Graz, Austria

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Elisabeth Lerchbaum Department of Internal Medicine, Division of Endocrinology and Diabetology, Medical University of Graz, Graz, Austria

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.4 nmol/L (vitamin D n  = 50, placebo n  = 50) 37 (27–50) years <75 nmol/L; 52 (42–66) nmol/L 18.0 (15.8–21.5) nmol/L TT measured using mass spectrometry 12 weeks 20,000 IU/week (~2,857 IU/day) vs placebo No significant effect 107 (89

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R Perchard Division of Developmental Biology & Medicine, School of Medical Sciences, Faculty of Biology, Medicine & Health, University of Manchester, Manchester, UK

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L Magee Division of Developmental Biology & Medicine, School of Medical Sciences, Faculty of Biology, Medicine & Health, University of Manchester, Manchester, UK

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A Whatmore Division of Developmental Biology & Medicine, School of Medical Sciences, Faculty of Biology, Medicine & Health, University of Manchester, Manchester, UK

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F Ivison Department of Biochemistry, Central Manchester University Hospitals NHS Foundation Trust, Manchester, UK

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P Murray Division of Developmental Biology & Medicine, School of Medical Sciences, Faculty of Biology, Medicine & Health, University of Manchester, Manchester, UK
Department of Paediatric Endocrinology, Royal Manchester Children’s Hospital, Central Manchester Foundation Hospitals NHS Trust, Manchester, UK

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A Stevens Division of Developmental Biology & Medicine, School of Medical Sciences, Faculty of Biology, Medicine & Health, University of Manchester, Manchester, UK

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M Z Mughal Department of Paediatric Endocrinology, Royal Manchester Children’s Hospital, Central Manchester Foundation Hospitals NHS Trust, Manchester, UK

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S Ehtisham Department of Paediatric Endocrinology, Royal Manchester Children’s Hospital, Central Manchester Foundation Hospitals NHS Trust, Manchester, UK

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J Campbell Department of Paediatric Endocrinology, Royal Manchester Children’s Hospital, Central Manchester Foundation Hospitals NHS Trust, Manchester, UK

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S Ainsworth Department of Paediatric Endocrinology, Royal Manchester Children’s Hospital, Central Manchester Foundation Hospitals NHS Trust, Manchester, UK

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M Marshall Department of Biochemistry, Central Manchester University Hospitals NHS Foundation Trust, Manchester, UK

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M Bone Department of General Paediatrics, Royal Manchester Children’s Hospital, Central Manchester Foundation Hospitals NHS Trust, Manchester, UK

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I Doughty Department of General Paediatrics, Royal Manchester Children’s Hospital, Central Manchester Foundation Hospitals NHS Trust, Manchester, UK

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P E Clayton Division of Developmental Biology & Medicine, School of Medical Sciences, Faculty of Biology, Medicine & Health, University of Manchester, Manchester, UK
Department of Paediatric Endocrinology, Royal Manchester Children’s Hospital, Central Manchester Foundation Hospitals NHS Trust, Manchester, UK

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D (serum 25(OH)D) assay Blood samples were centrifuged at 3000 g for 10 min at 17°C, and aliquots of sera were stored at −80°C. 25(OH)D was assayed using a 25-hydroxy vitamin D mass spectrometry method (Chromsystems) on an AB Sciex 5500 instrument

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Matilde Calanchini Oxford Centre for Diabetes, Endocrinology & Metabolism, Churchill Hospital, University of Oxford, Oxford, UK
Endocrinology & Metabolism Unit, CTO A. Alesini Hospital ASL Roma 2, Department of Systems Medicine, University of Rome Tor Vergata, Rome, Italy

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Michael Tadman Oxford Centre for Diabetes, Endocrinology & Metabolism, Churchill Hospital, University of Oxford, Oxford, UK

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Jesper Krogh Oxford Centre for Diabetes, Endocrinology & Metabolism, Churchill Hospital, University of Oxford, Oxford, UK

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Andrea Fabbri Endocrinology & Metabolism Unit, CTO A. Alesini Hospital ASL Roma 2, Department of Systems Medicine, University of Rome Tor Vergata, Rome, Italy

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Ashley Grossman Oxford Centre for Diabetes, Endocrinology & Metabolism, Churchill Hospital, University of Oxford, Oxford, UK

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Brian Shine Oxford Centre for Diabetes, Endocrinology & Metabolism, Churchill Hospital, University of Oxford, Oxford, UK

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.1258/0004563001899780 ) 13 Miller AG Brown H Degg T Allen K Keevil BG . Measurement of plasma 5-hydroxyindoleacetic acid by liquid chromatography tandem mass spectrometry–comparison with HPLC methodology . Journal of Chromatography: B, Analytical Technologies in

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Shilpa Lingaiah Department of Obstetrics and Gynaecology, PEDEGO Research Unit, Medical Research Centre, University of Oulu and Oulu University Hospital, Oulu, Finland

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Laure Morin-Papunen Department of Obstetrics and Gynaecology, PEDEGO Research Unit, Medical Research Centre, University of Oulu and Oulu University Hospital, Oulu, Finland

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Terhi Piltonen Department of Obstetrics and Gynaecology, PEDEGO Research Unit, Medical Research Centre, University of Oulu and Oulu University Hospital, Oulu, Finland

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Inger Sundström-Poromaa Department of Women’s and Children’s Health, Uppsala University, Uppsala, Sweden

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Elisabet Stener-Victorin Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden

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Juha S Tapanainen Department of Obstetrics and Gynaecology, PEDEGO Research Unit, Medical Research Centre, University of Oulu and Oulu University Hospital, Oulu, Finland
Department of Obstetrics and Gynaecology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland

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, 23 , 24 ). Of note, the number of subjects varied between analyses owing to a lack of measurements in some cases. Serum concentrations of testosterone and sex hormone-binding globulin (SHBG) were analysed by means of liquid chromatography-mass

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Kathrin R Frey Department of Medicine I, Endocrine and Diabetes Unit, University Hospital, University of Würzburg, Würzburg, Germany

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Tina Kienitz Charité – Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany

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Julia Schulz Charité – Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany

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Manfred Ventz Charité – Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany

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Kathrin Zopf Charité – Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany

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Marcus Quinkler Endocrinology in Charlottenburg, Berlin, Germany

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Winterer JC Loriaux DL . Daily cortisol production rate in man determuned by stable isotope dilution/mass spectrometry . Journal of Clinical Endocrinology and Metabolism 1991 72 39 – 45 . ( https://doi.org/10.1210/jcem-72-1-39 ) 10.1210/jcem-72

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Jay Toulany College of Pharmacy, Dalhousie University, Halifax, Nova Scotia, Canada

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Sebastian D Parlee Department of Molecular & Integrative Physiology, University of Michigan, Ann Arbor, Michigan, USA

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Christopher J Sinal Department of Pharmacology, Dalhousie University, Halifax, Nova Scotia, Canada

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Kathryn Slayter Canadian Centre for Vaccinology, IWK Health Centre, Nova Scotia Health Authority and Dalhousie University, Halifax, Nova Scotia, Canada

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Shelly McNeil Canadian Centre for Vaccinology, IWK Health Centre, Nova Scotia Health Authority and Dalhousie University, Halifax, Nova Scotia, Canada

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Kerry B Goralski College of Pharmacy, Dalhousie University, Halifax, Nova Scotia, Canada
Department of Pharmacology, Dalhousie University, Halifax, Nova Scotia, Canada

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with extreme caution. Ideally, future clinical studies should include measures of total chemerin or specific chemerin isoforms (using isoform-specific antibodies or mass spectrometry) combined with bioassay measures of CMKLR1 and/or GPR1 activation

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Barbara J Boucher The Blizard Institute, Queen Mary University of London, London, UK

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Alexandridou A Schorr P Stokes CS Volmer DA . Analysis of vitamin D metabolic markers by mass spectrometry: recent progress regarding the ‘gold standard’ method and integration into clinical practice . Mass Spectrometry Reviews 2021 [epub]. ( https

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Kevin C J Yuen Departments of Neuroendocrinology and Neurosurgery, Barrow Neurological Institute, University of Arizona College of Medicine and Creighton School of Medicine, Phoenix, Arizona, United States

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Gudmundur Johannsson Department of Endocrinology, Sahlgrenska University Hospital and Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

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Ken K Y Ho The Garvan Institute of Medical Research and the Faculty of Medicine, University of New South Wales, Sydney, Australia

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Bradley S Miller Pediatric Endocrinology, University of Minnesota Medical School, M Health Fairview Masonic Children’s Hospital, Minneapolis, Minnesota, United States

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Ignacio Bergada Centro de Investigaciones Endocrinológicas "Dr César Bergadá" (CEDIE), CONICET-FEI-División de Endocrinología, Hospital de Niños Ricardo Gutiérrez, Buenos Aires, Argentina

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Alan D Rogol Pediatric Diabetes and Endocrinology, University of Virginia, Charlottesville, Virginia, United States

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, immunoassays, and mass spectrometry ( 102 ), and currently, immunoassays are used most frequently. However, diagnostic errors may still be introduced by the large inter-assay variability of commercial and ‘in-house’ GH assays. A study comparing 96 laboratories

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Jan Roar Mellembakken Division of Gynecology and Obstetrics, Department of Reproductive Medicine, Oslo University Hospital, Oslo, Norway

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Azita Mahmoudan Division of Gynecology and Obstetrics, Department of Reproductive Medicine, Oslo University Hospital, Oslo, Norway

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Lars Mørkrid Department of Medical Biochemistry, Oslo University Hospital, Rikshospitalet, Oslo, Norway

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Inger Sundström-Poromaa Department of Women’s and Children’s Health, Uppsala University, Uppsala, Sweden

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Laure Morin-Papunen Department of Obstetrics and Gynecology, University Hospital of Oulu, University of Oulu, Medical Research Centre Oulu and PEDEGO Research Unit, Oulu, Finland

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Juha S Tapanainen Department of Obstetrics and Gynecology, University Hospital of Oulu, University of Oulu, Medical Research Centre Oulu and PEDEGO Research Unit, Oulu, Finland
Department of Obstetrics and Gynecology, Helsinki University Hospital and University of Helsinki, Helsinki, Uusimaa, Finland

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Terhi T Piltonen Department of Obstetrics and Gynecology, University Hospital of Oulu, University of Oulu, Medical Research Centre Oulu and PEDEGO Research Unit, Oulu, Finland

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Angelica Lindén Hirschberg Department of Women’s and Children’s Health, Karolinska Institutet and Department of Gynecology and Reproductive Medicine, Stockholm, Sweden

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Elisabet Stener-Victorin Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden

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Eszter Vanky Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology, Trondheim, UK
Department of Gynecology and Obstetrics, St. Olav’s Hospital, Trondheim, Norway

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Pernille Ravn Department of Gynecology and Obstetrics, Odense University Hospital, Odense, Denmark

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Richard Christian Jensen Department of Endocrinology, Odense University Hospital, Odense, Denmark

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Marianne Skovsager Andersen Department of Endocrinology, Odense University Hospital, Odense, Denmark

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Dorte Glintborg Department of Endocrinology, Odense University Hospital, Odense, Denmark

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measured by liquid chromatography–mass spectrometry (LC/MS), and SHBG was measured by chemiluminometric immunoassays as reported earlier ( 11 , 17 ). In Danish women, serum testosterone was analyzed using a specific radio-immunoassay after ether extraction

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