Other forces can cause differences in care from place to place as well Feeding tubes provide as good an example as any.

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In addition, doctors practicing today don't know where to place breast-feeding problems --breasts are attached to the women, so shouldn't they be the province of OBs, say pediatricians.

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The big European Central Bank refinancing operation on Wednesday is feeding a more positive attitude in the market place late this week.

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With new money on the table, the result was a feeding frenzy as providers scrambled to put in place systems that would qualify them for meaningful use incentive payments, and avoid payment cuts that are set to take effect in less than three years for those that lag behind.

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Until now, Viewpoint's strategy has been to place itself at the bottom of the feeding chain: film studios and special-effects houses customise its models before Steven Spielberg and his ilk weave them into their story lines.

ECONOMIST: Three-dimensional imaging