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