1 Image Sciences Institute, Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht University, Heidelberglaan 100, 3584 CX Utrecht, The Netherlands.
2 Rowett Institute, University of Aberdeen, Foresterhill Road, AB25 2ZD Scotland, United Kingdom.
3 Department of Nutrition-Dietetics, School of Health Science & Education, Harokopio University Athens, 70 El. Venizelou Avenue, 17671 Kallithea, Greece.
4 Image Sciences Institute, Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht University, Heidelberglaan 100, 3584 CX Utrecht, The Netherlands; Division of Human Nutrition, Wageningen University, Stippeneng 4, 6708 WE Wageningen, The Netherlands. Electronic address: p.smeets@umcutrecht.nl.