1. Faculty of Mathematics“Alexandru Ioan Cuza” University of Iaşi Iaşi 700506 Romania
2. “Octav Mayer” Institute of MathematicsRomanian Academy Iaşi 700506 Romania
3. ADAMSS (Centre for Advanced Applied Mathematical and Statistical Sciences)Università degli Studi di Milano La Statale Milano 20133 Italy
4. Department of Medical Informatics and BiostatisticsUniversity of Medicine and Pharmacy “Grigore T. Popa” Iaşi 700115 Romania