First Online: 16 October 2018
Compliance with Ethical Standards
: The authors Antonella Riva, Massimo Ronchi, Giovanna Petrangolini, Stefania Bosisio, and Pietro Allegrini are employees of Indena SpA.
: We did not receive any specific grant for this research from funding agencies in the public or not-for-profit sectors. The study was funded by Indena SpA.
: All procedures in this study are in accordance with the 1964 Helsinki Declaration (and its amendments) and the criteria of the ethics committee that approved the study.
: Written informed consent, as reviewed by the ethics committee, was obtained individually from all subjects who participated in the study.