Rivera César, Torres Ítalo, González-Arriagada Wilfredo Alejandro
Department of Biomedical Sciences, Faculty of Health Sciences, University of Talca, Talca, Maule Region, Chile.
Department of Health, Municipality of Lolol, O'Higgins Region, Chile.
BMJ. 2017 Oct 26;359:j4476. doi: 10.1136/bmj.j4476.