Incorporation of Frailties Into a Non-Proportional Hazard Regression Model and Its Diagnostics for Reliability Modeling of Downhole Safety Valves. - Francisco Louzada 001; José Alberto Cuminato; Oscar Mauricio Hernandez Rodriguez; Vera L. D. Tomazella; Eder Angelo Milani; Paulo Henrique Ferreira; Pedro Luiz Ramos; Gustavo Bochio; Ivan Carlos Perissini; Oilson Alberto Gonzatto Junior; Alex Leal Mota; Luis Felipe Acuña Alegría; et al. (IEEE Access, 2020)