1. Department I of Internal Medicine, University of Cologne, Cologne, Germany
2. Centre of Excellence for Nutrition, Nutritional Epidemiology and Biostatistics, North West University South Africa, Potchefstroom, South Africa
3. Faculty of Health Sciences, Mary MacKillop Institute for Health Research, Department Melbourne, Australian Catholic University, Melbourne, Australia
4. Division for Quantitative Methods in Public Heallth and Health Services Research, Private University of Health Sciences Medical Informatics and Technology, Hall, Austria
5. School of Medical and Health Sciences, Edith Cowan University, Perth, Australia
6. Faculty of Medicine, Institute of Epidemiology and Preventive Medicine, University of Regensburg, Regensburg, Germany