1 Center for Statistics, Hasselt University, Hasselt, Belgium; Data Science Institute, Hasselt University, Hasselt, Belgium.
2 Center for Statistics, Hasselt University, Hasselt, Belgium; Data Science Institute, Hasselt University, Hasselt, Belgium; Department of Biostatistics and Medical Informatics, Medical University of Bialystok, Bialystok, Poland.
3 Center for Statistics, Hasselt University, Hasselt, Belgium; Data Science Institute, Hasselt University, Hasselt, Belgium. Electronic address: dirk.valkenborg@uhasselt.be.