Michele DAlo, (
Email)
1, Gaia Bertarelli, (
Email)
2, Loredana Di Consiglio, (
Email)
1,
Andrea Fasulo, (Email) 1, Maria Giovanna Ranalli, (
Email)
3, Fabrizio Solari, (
Email)
1, Guandalini Alessio, (
Email)
1, Daddi Stefano, (
Email)
1
1 Istituto Nazionale di Statistica, Rome, Italy, 2 University of Pisa, Pisa, Italy, 3 University of Perugia, Perugia, Italy