The mean RNFL thickness and macular volume were significantly reduced in secondary progressive MS, but not in primary progressive MS when compared with control RNFL thickness and macular volume.

继发性进展性多发性硬化患者平均视网膜神经纤维层的厚度和黄斑面积值亦降低，但与原发性进展性多发性硬化相比不降低。

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The answer is simple: For two or three generations, Republicans have defeated progressive reform of the health care system by hinting that it would mean redistributing wealth from whites to blacks.

NPR: The Nation: Race, Lies And Health Scares

Some mean that we need more revenue, and others believe that the system should be more progressive for the sake of fairness.

FORBES: How Much Of A Stretch Is It For John Kerry To Pin Supercommittee Fail On Grover Norquist?