1. Laboratory for Human Nutrition, ETH, Zurich CH-8092, Switzerland
2. Nutritional Intervention Research Unit, Medical Research Council, Cape Town 7505, South Africa
3. Centre of Excellence in Nutrition, North-West University, Potchefstroom 2530, South Africa
4. Research Center Human Nutrition and Health, DSM Nutritional Products Ltd., Kaiseraugst CH-4303, Switzerland
5. Division of Human Nutrition, Wageningen University, Wageningen NL-6703, The Netherlands