Han, L., M. A. Pisani, K. B. Araujo, and H. G. Allore. “Use of Self-Matching to Control for Stable Patient Characteristics While Addressing Time-Varying Confounding on Treatment Effect: A Case Study of Older Intensive Care Patients”. International Journal of Statistics in Medical Research, vol. 5, no. 1, Jan. 2016, pp. 8-16, doi:10.6000/1929-6029.2016.05.01.2.