Written, informed consent was obtained from all the volunteers
before the studies began. The protocol was approved by the Ethics
Committee of the Institute of Nutrition and Food Technology,
University of Chile and the doses of radioactive isotopes used were
approved by the Chilean Commission on Nuclear Energy. Radioisotope
labeling of heme Fe protocols in rabbits and calves were
approved by the Bioethics Committee of the Institute of Nutrition
and Food Technology, University of Chile and by the Bioethics
Advisory Committee of the National Fund for Science and Technology
(FONDECYT) of Chile.