7 References

1.
Gagne JJ, Glynn RJ, Avorn J, Levin R, Schneeweiss S. A combined comorbidity score predicted mortality in elderly patients better than existing scores. J Clin Epidemiol. 2011;64(7):749-759. doi:10.1016/j.jclinepi.2010.10.004
2.
Sun JW, Rogers JR, Her Q, et al. Adaptation and validation of the combined comorbidity score for ICD-10-CM. Med Care. 2017;55(12):1046-1051. doi:10.1097/MLR.0000000000000824
3.
Lip R G. Y. H. Refining clinical risk stratification for predicting stroke and thromboembolism in atrial fibrillation using a novel risk factor-based approach: The euro heart survey on atrial fibrillation. Chest J. 2010;137(2):263-272. doi:10.1378/chest.09-1584
4.
Bateman JM B. T. Development of a comorbidity index for use in obstetric patients. Obstet Gynecol. 2013;122(5):957-965. doi:10.1097/AOG.0b013e3182a603bb
5.
Kim S D. H. Measuring frailty in medicare data: Development and validation of a claims-based frailty index. J Gerontol Ser A. 2018;73(7):980-987. doi:10.1093/gerona/glx229
6.
Sun JW, Bourgeois FT, Haneuse S, et al. Development and validation of a pediatric comorbidity index. Am J Epidemiol. 2021;190(5):918-927. doi:10.1093/aje/kwaa244
7.
Fireman B, Lee J, Lewis N, Bembom O, van der Laan M, Baxter R. Influenza vaccination and mortality: Differentiating vaccine effects from bias. Am J Epidemiol. 2009;170(5):650-656. doi:10.1093/aje/kwp173
8.
Shu D, Yoshida K, Fireman BH, Toh S. Inverse probability weighted cox model in multi-site studies without sharing individual-level data. Stat Methods Med Res. 2020;29(6):1668-1681. doi:10.1177/0962280219869742
9.
Galimberti S, Sasieni P, Valsecchi MG. A weighted kaplan-meier estimator for matched data with application to the comparison of chemotherapy and bone-marrow transplant in leukaemia. Stat Med. 2002;21(24):3847-3864. doi:10.1002/sim.1357
10.
Satagopan JM, Ben-Porat L, Berwick M, Robson M, Kutler D, Auerbach AD. A note on competing risks in survival data analysis. Br J Cancer. 2004;91(7):1229-1235. doi:10.1038/sj.bjc.6602102