1. Faculty of Medicine and Life Sciences, Discipline Group Physiology, Biochemistry and Immunology, Biomedical Research Institute and Transnational University Limburg, Hasselt University, Hasselt, Belgium;
2. Department of Surgical Oncology, Ziekenhuis Oost-Limburg, Genk, Belgium;
3. Department of Laboratory Medicine, Ziekenhuis Oost-Limburg, Genk, Belgium;
4. Center for Gastrointestinal Malignancies, MedStar Washington Hospital Center, Washington, DC, USA;
5. Laboratory for Organic and Bio-organic Synthesis, Department of Organic and Macromolecular Chemistry, Ghent University, Gent, Belgium