May, P., Garrido, M. M., Cassel, J. B., Morrison, R. S., & Normand, C. (2016). Using Length of Stay to Control for Unobserved Heterogeneity When Estimating Treatment Effect on Hospital Costs with Observational Data: Issues of Reliability, Robustness, and Usefulness. Health Serv Res.

May, Peter, Melissa M. Garrido, J. Brian Cassel, R. Sean Morrison, a Charles Normand. "Using Length of Stay to Control for Unobserved Heterogeneity When Estimating Treatment Effect On Hospital Costs With Observational Data: Issues of Reliability, Robustness, and Usefulness." Health Serv Res 2016.

May, Peter, et al. "Using Length of Stay to Control for Unobserved Heterogeneity When Estimating Treatment Effect On Hospital Costs With Observational Data: Issues of Reliability, Robustness, and Usefulness." Health Serv Res 2016.