Gabriel, Okyere Asare, et al. “Gompertz Distribution for Survival of Inpatients With Cluster Comorbidities”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 16, no. 1, May 2014, pp. 81-86, https://gssrr.org/JournalOfBasicAndApplied/article/view/2216.