Gracia Baena JM, Calaf Vall I, Zielonka M, Marsal Mora JR, Godoy P, Worner Diz F. Risk factors and comorbidities associated with severe aortic stenosis: a case-control study. Rev Clin Esp. 2021 May 23;221(5):249-57. doi: 10.1016/j.rce.2020.01.010.
Xiong Y, Cao F, Chen L, Yan C, Zhou W, Chen Y, Endo Y, Leng X, Mi B, Liu G. Identification of key microRNAs and target genes for the diagnosis of bone nonunion. Mol Med Rep. 2020 Apr;21(4):1921-33. doi: 10.3892/mmr.2020.10996
Raghunathan K, Layton JB, Ohnuma T, Shaw AD. Observational research using propensity scores. Adv Chronic Kidney Dis. 2016 Nov;23(6):367-72. doi: 10.1053/j.ackd.2016.11.010