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. 2015 Jun 2;26(4):505–508. doi: 10.1097/EDE.0000000000000302

FIGURE.

FIGURE.

Covariate balance by levels of treatment (squares) and levels of the proposed instrument (triangles) using individual level data published by Davies et al.7 (N = 359,736). Notes: Covariates binary variables, robust standard errors clustered by physician.