1. Center for Human Nutrition and Atkins Center of Excellence in Obesity Medicine, Washington University School of Medicine, St. Louis, Missouri
2. Department of Clinical Medicine, Sapienza University of Rome, Rome, Italy
3. Department of Medical Sciences, IRCCS San Raffaele, Rome, Italy
4. Division of Endocrinology, Department of Internal Medicine, Maastricht University Medical Centre, Maastricht, the Netherlands.