We thank the Dietary Evaluation Department at the HNRCA, Tufts University, for their advice and support with the food-frequency questionnaire; Gerard Dallal, Chief of the Biostatistics Unit at the HNRCA, for his advice; and I Blanco, C Herrero, T Motilla, and P Martínez (personnel at the Clínica Puerta de Hierro, Madrid) and the participants of the study for their enthusiasm
and contributions to the study.