1. Department of Applied Mathematics, Computer Science and Statistics, Ghent University, Ghent B-9000, Belgium
2. Porto Conte Ricerche, Science and Technology Park of Sardinia, Tramariglio, Alghero 07041, Italy
3. VIB-UGent Center for Medical Biotechnology, VIB, Ghent B-9000, Belgium
4. Department of Biochemistry, Ghent University, Ghent B-9000, Belgium