From the Rheumatology Department, Hospital Padre Hurtado; and Facultad de Medicina Clínica Alemana–Universidad del Desarrollo, Santiago, Chile.
No financial support was received for this study.
The authors declare no conflict of interest.
The views expressed in the submitted article are the authors' own and not an official position of the institutions.
Correspondence: Sebastián Ibáñez, MD, Avenida Manquehue Norte 1410, piso 7°, Vitacura, Santiago, Chile. E-mail: firstname.lastname@example.org.
Online date: March 29, 2018