Flaws in Dartmouth Atlas' health care cost analysis

Have to cite this because Bismarck, ND and Houston are mentioned in the same sentence and how often does that happen?

But the real difference in costs between, say, Houston and Bismarck, N.D., may result less from how doctors work than from how patients live. Houstonians may simply be sicker and poorer than their Bismarck counterparts. Also, nurses in Houston tend to be paid more than those in North Dakota because the cost of living is higher in Houston. Neither patients’ health nor differences in prices are fully considered by the Dartmouth Atlas.