Govindarajulu, Usha S., and Elizabeth J. Malloy. “Evaluating Treatment Effect in Multicenter Trials With Small Centers Using Survival Modeling”. International Journal of Statistics in Medical Research 4, no. 1 (December 27, 2015): 8–25. Accessed May 9, 2024. https://lifescienceglobal.com/pms/index.php/ijsmr/article/view/2684.