“…Like many other studies in the past [6,7,8,10,11,12,13,14,16,17,18,19,20,21,22,23,24,25], only a limited number of patients was available for the study. To effectively use the limited number of patients, we conducted a survival analysis of these patients at the beginning and found a biphasic survival curve indicating that there were 2 groups of patients (Fig.…”