A. Zea-Vera, C. Liendo-Caro, L. Luna-Carrillo, Y. Prevost-Ruiz, A. Castañeda-Guarderas, and G. Málaga, “Knowledge of epidemiological risk indicators used in clinical trials among medical students in advanced years and medical residents”, Rev Peru Med Exp Salud Publica, vol. 29, no. 2, Jan. 2014, doi: 10.17843/rpmesp.2012.292.344.