1. Biomedical Research Laboratories, Faculty of Medicine, Catholic University of Maule, Talca 34600000, Chile
2. Department of Radiology, Faculty of Medicine, University of Concepción, Concepción 4030000, Chile
3. Centre of Primary Attention, South Metropolitan Health Service, Santiago 3830000, Chile
4. Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY 10021, USA