Evaluating the effect of hospital and insurance type on the risk of 1-year mortality of very low birth weight infants: controlling for selection bias.
Ounpraseuth S, Gauss CH, Bronstein J, Lowery C, Nugent R, Hall R. Evaluating the effect of hospital and insurance type on the risk of 1-year mortality of very low birth weight infants: controlling for selection bias. Med Care. 2012 Apr; 50(4):353-60.