1. Multisensor System and Pattern Recognition Research Group (GISM), Electronic Engineering Program, Universidad de Pamplona, Pamplona, Colombia
2. Department of Electronics, Electrical and Automatic Engineering, Rovira i Virgili University, Tarragona, Spain
3. GASTROSUR S.A., Universidad Nacional de Colombia, Facultad de Medicina, Bogotá, Colombia
4. Hospital Universitario la Samaritana, Bogotá, Colombia
5. Mechatronics Engineering Department, Universidad Autónoma del Caribe, Barranquilla, Colombia
6. Molecular Fingerprint Sweden AB, Uppsala, Sweden
7. Department of Solid State Physics, The Ångström Laboratory, Uppsala University, Uppsala, Sweden