1 Department of Clinical Research, Basel Institute for Clinical Epidemiology and Biostatistics, University Hospital Basel, Switzerland.
2 Department of Clinical Epidemiology and Biostatistics, McMaster University, Hamilton, Ontario, Canada.
3 Department of Internal Medicine, St Antonius Hospital, Nieuwegein.
4 Department of Internal Medicine, Leiden University Medical Center, The Netherlands.
5 Endocrinology, Diabetology and Metabolism, Department of Internal Medicine and Department of Clinical Research, University Hospital Basel, Switzerland.