Text and Data Mining valid from 2018-07-13
Received: 30 March 2018
Accepted: 5 July 2018
First Online: 13 July 2018
Ethics approval and consent to participate
: We obtained our local IRB approval (Ethical Committee: Comité de Ética de la Investigación, Facultad de Medicina, Clínica Alemana - Universidad del Desarrollo), and every patient gave their consent to participate in this study. All procedures performed in this study were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Not applicable
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.