Text and Data Mining valid from 2018-01-18
Received: 26 July 2017
Accepted: 3 January 2018
First Online: 18 January 2018
Compliance with ethical standards
: Drs. I. Oropesa, F. Pérez Escamirosa, J.A. Sánchez Margallo, S. Enciso, B. Rodríguez-Vila, A. Minor Martínez, F.M Sánchez-Margallo, P. Sánchez-González, and E.J. Gómez have no conflict of interests or financial ties to disclose.