Alves, K. R., A. C. Goulart, R. M. Ladeira, I. R. S. de Oliveira, and I. M. Benseñor. “Frequency of Cholecystectomy and Associated Sociodemographic and Clinical Risk Factors in the ELSA-Brasil Study”. São Paulo Medical Journal, vol. 134, no. 3, June 2016, pp. 240-5, https://periodicosapm.emnuvens.com.br/spmj/article/view/1060.