【作者(必填)】
Samuel D. Pimentel, Rachel R. Kelz, Jeffrey H. Silber & Paul R. Rosenbaum
【文题(必填)】 Large, Sparse Optimal Matching With Refined Covariate Balance in an Observational Study of the Health Outcomes Produced by New Surgeons【年份(必填)】
2015
【全文链接或数据库名称(选填)】 http://www.tandfonline.com/doi/full/10.1080/01621459.2014.997879#.VePQs1Wqqko