Funding for this research was provided by:
Ministero della Salute and Regione Toscana (GR-2010-2316359)
Text and Data Mining valid from 2019-01-02
Received: 12 October 2018
Revised: 26 November 2018
Accepted: 17 December 2018
First Online: 2 January 2019
Compliance with ethical standards
: The authors have no conflict of interest to report.
: All procedures involving experiments on human subjects have been done in accordance with the ethical standards of the Committee on Human Experimentation of the institution in which the experiments were done or in accordance with the Helsinki Declaration of 1975. Specific national laws have been observed.