1. From the Immunonutrition Group, Department of Metabolism and Nutrition, Consejo Superior de Investigaciones Científicas, Madrid, Spain (JW, EN, JR and AM); the Unit for Preventive Nutrition, Department of Biosciences and Nutrition, NOVUM, Karolinska Institutet, Stockholm, Sweden (JW, JRR, FBO, and MS); the Escuela Universitaria Ciencias de la Salud, University of Zaragoza, Spain (LAM, MIM and MB)