Funding for this research was provided by:
Ministero dell’Istruzione, dell’Università e della Ricerca (PRIN-MIUR 2012JA4BTY_003, PRIN-MIUR 2012JA4BTY_004)
Sapienza Università di Roma (RM116154C9BE2C3F, C26A153PCN)
Received: 20 October 2017
Accepted: 19 January 2018
First Online: 12 February 2018
Ethics approval and consent to participate
: The study was approved by the "Policlinico Umberto I, Sapienza Università di Roma" ethical committee (reference numbers 496/13 and 1016/10), who considered the list of collaborators, anonymity of samples and the compliance with consent regulations. We obtained an appropriate informed consent for DNA samples analysed in this study and all the procedures were in accordance with the Helsinki Declaration.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.