Tangianu, F., P. Gnerre, F. Colombo, R. Frediani, G. Pinna, F. Berti, G. Mathieu, M. La Regina, F. Orlandini, A. Mazzone, C. Canale, D. Borioni, and R. Nardi. “Could Clustering of Comorbidities Be Useful for Better Defining the Internal Medicine patients’ Complexity?”. Italian Journal of Medicine, vol. 12, no. 2, June 2018, pp. 137-44, doi:10.4081/itjm.2018.940.