Nonproportional hazards model with a frailty term for modeling subgroups with evidence of long-term su: application to a lung cancer dataset - Gazon, Amanda Buosi; Milani, Eder Angelo; Mota, Alex Leal; Louzada, Francisco; Tomazella, Vera Lucia Damasceno; Calsavara, Vinicius Fernando (Biometrical Journal, 2022)