Text and Data Mining valid from 2019-03-29
First Online: 29 March 2019
Compliance with Ethical Standards
: No sources of funding were used to assist in the preparation of this study. Authors at the University of Bologna (ER, EP, FDP) are supported by Institutional Research Funds (Ricerca Fondamentale Orientata).
: Emanuel Raschi, Alessandra Mazzarella, Ippazio Cosimo Antonazzo, Nicolò Bendinelli, Emanuele Forcesi, Marco Tuccori, Ugo Moretti, Elisabetta Poluzzi, and Fabrizio De Ponti declare that they have no conflicts of interest that might be relevant to the contents of this manuscript.