1. Department of Physics University of Beira Interior Covilhã Portugal
2. Health Sciences Research Centre (CICS‐UBI) University of Beira Interior Covilhã Portugal
3. Clinical and Experimental Centre in Vision Sciences (CCECV) University of Beira Interior Covilhã Portugal
4. Gastroenterology Department Centro Hospitalar e Universitário Coimbra Coimbra Portugal
5. Faculty of Medicine University of Coimbra Coimbra Portugal
6. Centre of Mathematics and Applications (CMA‐UBI), Department of Mathematics University of Beira Interior Covilhã Portugal