1 Department of Laboratory Medicine, National University Hospital, Singapore, Singapore.
2 Department of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California, USA.
3 Cambridge University Hospitals Trust, Addenbrookes Hospital, Cambridge, United Kingdom.
4 Department of Medicine, University of Southern California, Los Angeles, California, USA.
5 Ref4U (Former Laboratory for Analytical Chemistry)-Laboratory of Toxicology, Department of Bioanalysis, Faculty of Pharmaceutical Sciences, Ghent University, Ghent, Belgium.
6 Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin and Berlin Institute of Health, Institut für Experimentelle Endokrinologie, Berlin, Germany.