Received: 24 July 2019
Accepted: 24 December 2019
First Online: 13 January 2020
Compliance with ethical standards
: Jaime Ruiz-Tovar, MD, PhD; Gilberto Gonzalez, MD; Andrei Sarmiento, MD; Miguel A. Carbajo, MD, PhD; Javier Ortiz-de-Solorzano, MD; Maria Jose Castro, MD, PhD; Jose Maria Jimenez, PhD; and Lorea Zubiaga, MD, PhD have no conflicts of interest or financial ties to disclose.